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'''Supply-side economics''' is a [[Finance:Macroeconomics|macroeconomic]] theory postulating that [[Finance:Economic growth|economic growth]] can be most effectively fostered by lowering taxes, [[Finance:Deregulation|decreasing regulation]], and allowing [[Social:Free trade|free trade]].<ref name="GoodwinHarris2015">{{cite book |author1=Neva Goodwin |author2=Jonathan M. Harris |author3=Julie A. Nelson |author4=Brian Roach |author5=Mariano Torras |title=Principles of Economics in Context |url=https://books.google.com/books?id=JvHqBgAAQBAJ&pg=PA286 |date=March 4, 2015 |publisher=[[Company:Routledge|Routledge]] |isbn=978-1-317-46217-0 |page=286 |quote=supply-side-economics: the macroeconomic theory ... .}}</ref><ref name="Dwivedi2010">{{cite book|author=Dwivedi|title=Macroeconomics, 3E|url=https://books.google.com/books?id=ChuoPjW9NXcC&pg=PA372|year=2010|publisher=Tata McGraw-Hill Education|isbn=978-0-07-009145-0|page=372|quote=The supply-side economics is the most recent macroeconomic thought.}}</ref> According to supply-side economics, consumers will benefit from greater supplies of goods and services at lower prices, and employment will increase.<ref>{{cite book |title=The Way the World Works: How Economies Fail—and Succeed |last=Wanniski |first=Jude |year=1978 |publisher=Basic Books |location=New York |isbn=0-465-09095-8 |url=https://archive.org/details/wayworldworks00jude }}</ref> Supply-side fiscal policies are designed to increase [[Finance:Aggregate supply|aggregate supply]], as opposed to [[Aggregate demand|aggregate demand]], thereby expanding output and employment while lowering prices. Such policies are of several general varieties:
#Investments in human capital, such as education, healthcare, and encouraging the transfer of technologies and business processes, to improve productivity (output per worker). Encouraging globalized free trade via [[Finance:Containerization|containerization]] is a major recent example.
#Tax reduction, to provide incentives to work, invest and take risks. Lowering income tax rates and eliminating or lowering tariffs are examples of such policies.
#Investments in new capital equipment and research and development (R&D), to further improve productivity. Allowing businesses to depreciate capital equipment more rapidly (e.g., over one year as opposed to 10) gives them an immediate financial incentive to invest in such equipment.
#Reduction in government regulations, to encourage business formation and expansion.<ref name="Chiang_Macrotext">{{cite book| last = Chiang| first = Eric| title = CoreMacroeconomics | edition = 3rd | publisher = Worth Publishers| year = 2014| page = 245| isbn = 978-1-4292-7849-2}}</ref>

A basis of supply-side economics is the [[Finance:Laffer curve|Laffer curve]], a theoretical relationship between rates of taxation and [[Finance:Government revenue|government revenue]].<ref>{{Cite journal|last=Campbell|first=John L.|date=1998|title=Institutional Analysis and the Role of Ideas in Political Economy|url=https://www.jstor.org/stable/657900|journal=Theory and Society|volume=27|issue=3|pages=377–409|doi=10.1023/A:1006871114987|jstor=657900|s2cid=145064609|issn=0304-2421|quote=The Laffer curve became a powerful pedagogical symbol that many supply siders used when presenting their position.}}</ref><ref>{{Cite journal|last1=Kyer|first1=Ben L.|last2=Maggs|first2=Gary E.|date=1994|title=A Macroeconomic Approach to Teaching Supply-Side Economics|journal=The Journal of Economic Education|volume=25|issue=1|pages=44–48|doi=10.2307/1182895|issn=0022-0485|jstor=1182895}}</ref><ref>{{Cite book|last=Kolb|first=Robert W.|url=https://books.google.com/books?id=eHxTDwAAQBAJ&q=%22supply-side+economics%22+tenet&pg=PA3303|title=The SAGE Encyclopedia of Business Ethics and Society|date=March 27, 2018|publisher=SAGE Publications|isbn=978-1-4833-8151-0|pages=3303|language=en}}</ref><ref>{{Cite book|last=Mankiw|first=N. Gregory|url=https://books.google.com/books?id=KQfFDwAAQBAJ&q=%22supply-side+economics%22+%22revenue%22&pg=PP1|title=Principles of Economics|date=January 1, 2020|publisher=Cengage Learning|isbn=978-0-357-13380-4|pages=161–162|language=en}}</ref>  The Laffer curve suggests that when the tax level is too high, lowering tax rates will boost government revenue through higher [[Finance:Economic growth|economic growth]], though the level at which rates are deemed "too high" is disputed.<ref>"the U.S. marginal top rate is far from the top of the Laffer curve." {{Cite journal|url=https://digitalcommons.unl.edu/econfacpub/54|title=The Elasticity of Taxable Income with Respect to Marginal Tax Rates: A Critical Review|first1=Emmanuel|last1=Saez|first2=Joel|last2=Slemrod|first3=Seth|last3=Giertz|date=January 1, 2009|journal=Economics Department Faculty Publications}}</ref><ref>“There is certainly some level of taxation at which cutting tax rates would be win-win. But few economists believe that tax rates in the United States have reached such heights in recent years; to the contrary, they are likely below the revenue-maximizing level” {{cite magazine |last1=Mankiw |first1=R. Gregory |title=Snake-Oil Economics | date=2018-12-11 |url=https://www.foreignaffairs.com/reviews/review-essay/2018-12-11/snake-oil-economics |publisher=Foreign Affairs}}</ref>{{ r | Mankiw_SO_2}} A 2012 poll of leading economists found none agreed that reducing the US federal income tax rate would result in higher annual tax revenue within five years.<ref>{{Cite web|url=http://www.igmchicago.org/surveys/laffer-curve|title=Laffer Curve {{!}} IGM Forum|website=igmchicago.org|language=en-US|access-date=2017-10-14}}</ref> Critics also argue that several large tax cuts in the United States over the last 40 years have not increased revenue.<ref>{{Cite web|url=https://www.thefiscaltimes.com/2019/03/13/Once-Again-GOP-Tax-Cuts-Are-Not-Paying-Themselves|title=Once Again: The GOP Tax Cuts Are Not Paying for Themselves|website=The Fiscal Times}}</ref><ref>{{Cite web|url=https://www.politifact.com/factchecks/2017/apr/28/rana-foroohar/trumps-tax-plan-prompts-question-can-tax-cuts-real/|title=PolitiFact - Do tax cuts pay for themselves? Evidence is thin|website=@politifact}}</ref><ref>{{Cite journal |last=Komlos |first=John |date=2019 |title=Reaganomics: A Watershed Moment on the Road to Trumpism |url=https://econpapers.repec.org/article/bpjevoice/v_3a16_3ay_3a2019_3ai_3a1_3ap_3a21_3an_3a1.htm |journal=The Economists' Voice |volume=16 |issue=1|doi=10.1515/ev-2018-0032 |s2cid=159222280 }}</ref>

The term "supply-side economics" was thought for some time to have been coined by the journalist Jude Wanniski in 1975; according to Robert D. Atkinson, the term "supply side" was first used in 1976 by Herbert Stein (a former economic adviser to President Richard Nixon) and only later that year was this term repeated by Jude Wanniski.<ref>{{cite book|author=Robert D. Atkinson|title=Supply-Side Follies: Why Conservative Economics Fails, Liberal Economics Falters, and Innovation Economics Is the Answer|url=https://books.google.com/books?id=lv0GSig8CAAC|date=October 29, 2007|page=50|publisher=Rowman & Littlefield|isbn=978-0-7425-5107-7}}</ref> The term alludes to ideas of the economists [[Biography:Robert Mundell|Robert Mundell]] and Arthur Laffer.

== Historical origins ==
[[File:Rmundell.jpg|thumb|Robert Mundell popularized the theory of supply-side economics after developing the theory with Arthur Laffer in the 1970s<ref>{{cite news |title=Robert Mundell, the intellectual father of supply-side economics, is dead at 88 |url=https://www.washingtonexaminer.com/news/robert-mundell-intellectual-father-supply-side-economics-died |access-date=23 September 2022 |work=Washington Examiner |date=5 April 2021 |language=en}}</ref>]]
Supply-side economics developed in response to the stagflation of the 1970s.<ref name="case_780">Case, Karl E. & Fair, Ray C. (1999). ''Principles of Economics'' (5th ed.), p. 780. Prentice-Hall. {{ISBN|0-13-961905-4}}.</ref> It drew on a range of non-[[Finance:Keynesian economics|Keynesian economic thought]], including the Chicago School and New Classical School.<ref>{{cite book|url=https://books.google.com/books?id=-zVTD8v_qlsC&q=supply%20side%20economics%20chicago%20school&pg=PA105|title=A Critical Evaluation of the Chicago School of Antitrust Analysis|first1=I.|last1=Schmidt|first2=J. B.|last2=Rittaler|date=February 28, 1989|publisher=Springer Science & Business Media|via=Google Books|isbn=9789024737925}}</ref><ref>{{cite book|url=https://books.google.com/books?id=s8SEaWZrSEQC|title=Supply-Side Tax Policy: Its Relevance to Developing Countries|first1= Ved P.|last1=Gandhi|first2= Liam P.|last2=Ebrill|first3= Parthasrathi|last3=Shome|first4= Luis A. Manas|last4=Anton|first5=Jitendra R.|last5=Modi|first6= Fernando J.|last6=Sanchez-Ugarte|first7= G. A.|last7=Mackenzie|date=June 15, 1987|publisher=International Monetary Fund|via=Google Books|isbn=9781455271962}}</ref> Bruce Bartlett, an advocate of supply-side economics, traced the school of thought's intellectual descent from the philosophers [[Biography:Ibn Khaldun|Ibn Khaldun]] and [[Biography:David Hume|David Hume]], satirist Jonathan Swift, political economist [[Biography:Adam Smith|Adam Smith]] and United States Secretary of the Treasury Alexander Hamilton.<ref>{{Cite journal|first=Bruce|last=Bartlett|title=Supply-Side Economics: "Voodoo Economics' or Lasting Contribution?|journal=Laffer Associates: Supply-Side Investment Research|issue=November 11, 2003|url=http://web.uconn.edu/cunningham/econ309/lafferpdf.pdf|access-date=November 17, 2008|archive-date=October 13, 2017|archive-url=https://web.archive.org/web/20171013113314/http://web.uconn.edu/cunningham/econ309/lafferpdf.pdf|url-status=dead}}</ref>

Bartlett stated in 2007 that

{{blockquote|Today, hardly any economist believes what the Keynesians believed in the 1970s and most accept the basic ideas of supply-side economics – that incentives matter, that high tax rates are bad for growth, and that inflation is fundamentally a monetary phenomenon. Consequently, there is no longer any meaningful difference between supply-side economics and mainstream economics.

...

Today, supply-side economics has become associated with an obsession for cutting taxes under any and all circumstances. No longer do its advocates in Congress and elsewhere confine themselves to cutting marginal tax rates – the tax on each additional dollar earned – as the original supply-siders did. Rather, they support even the most gimmicky, economically dubious tax cuts with the same intensity. ... today it is common to hear tax cutters claim, implausibly, that ''all'' tax cuts raise revenue.{{ r | Bartlett }}<!-- Note that the emphasis on the word "all" is in the source. -->}}

Current day advocates of supply-side economic policies claim that lower tax rates produce macroeconomic benefits and emphasize this benefit rather than their traditional ideological [[Philosophy:Classical liberalism|Classical liberals]] opposion to taxation  because they opposed government in general. Their traditional claim was that each man had a right to himself and his property and therefore taxation was immoral and of questionable legal grounding.<ref>Gray (1995). ''Liberalism''. Minneapolis: University of Minnesota Press. {{ISBN|0-8166-2801-7}}. pp. 26–27</ref> On the other hand, supply-side economists argued that the alleged collective benefit (i.e. increased economic output and efficiency) provided the main impetus for tax cuts.

As in [[Finance:Classical economics|classical economics]], supply-side economics proposed that production or [[Finance:Supply (economics)|supply]] is the key to economic prosperity and that [[Finance:Consumption (economics)|consumption]] or [[Finance:Demand|demand]] is merely a secondary consequence. Early on, this idea had been summarized in Say's Law of economics, which states: "A product is no sooner created, than it, from that instant, affords a market for other products to the full extent of its own value."

Supply-side economics rose in popularity among Republican Party politicians from 1977 onwards. Prior to 1977, Republicans were more split on tax reduction, with some worrying that tax cuts would fuel inflation and exacerbate deficits.<ref>{{Cite journal|last1=Burns|first1=John W.|last2=Taylor|first2=Andrew J.|date=2000|title=The Mythical Causes of the Republican Supply-Side Economics Revolution|journal=Party Politics|language=en|volume=6|issue=4|pages=419–440|doi=10.1177/1354068800006004002|s2cid=144473289|issn=1354-0688}}</ref>

In 1978, Jude Wanniski published ''The Way the World Works'' in which he laid out the central thesis of supply-side economics<ref>{{Cite journal|last1=Gross|first1=Neil|last2=Medvetz|first2=Thomas|last3=Russell|first3=Rupert|date=August 11, 2011|title=The Contemporary American Conservative Movement|journal=Annual Review of Sociology|language=en|volume=37|issue=1|pages=325–354|doi=10.1146/annurev-soc-081309-150050|issn=0360-0572|quote=Jude Wanniski, who wrote the supply-side economics bible, The Way the World Works (1978), while an AEI scholar-in-residence}}</ref> and detailed the failure of high tax rate progressive income tax systems and United States monetary policy under Richard Nixon and [[Biography:Jimmy Carter|Jimmy Carter]] in the 1970s. Wanniski advocated lower tax rates and a return to some kind of [[Chemistry:Gold standard|gold standard]], similar to the 1944–1971 Bretton Woods System that Nixon abandoned.

[[File:Laffer-Curve.svg|thumb|upright=1.05|Three different Laffer curves: {{mvar|t*}} represents the rate of taxation at which maximal revenue is generated and the curve need not be single-peaked nor symmetrical]]

== Definition and principles ==
[[File:Human hours worked per week.webp|thumb|262px|Human-hours worked per week <br> in the United States <br> Labor is supply, money is demand]]

James D. Gwartney and Richard L. Stroup provide a definition of supply-side economics as the belief that adjustments in marginal tax rates have significant effects on the total supply.<ref name=":1">{{Cite book|last1=Gwartney|first1=James D.|title=Macroeconomics, 4th ed.|last2=Stroup|first2=Richard L.|publisher=Harcourt Brace Jovanovich|year=1987|pages=253}}</ref> Gwartney and Stroup said "that the supply-side argument provided the foundation for the Reagan tax policy, which led to significant reductions in marginal tax rates in the United States during the 1980s".<ref name=":1" />

Barry P. Bosworth has provided another definition by presenting the supply-side economics from two perspectives:

# "A broad interest in the determinants of aggregate supply – the volume and quality of the capital and labor inputs and the efficiency with which they are used"<ref name=":3">{{Cite book|last=Bosworth |first=Barry P. |url=http://worldcat.org/oclc/797160531|title=Tax incentives and economic growth|date=1984|publisher=Brookings Institution|isbn=0-8157-1035-6|oclc=797160531}}</ref>
# "A narrower focus on tax reductions as a means of increasing the supply of savings, investment, and labor."<ref name=":3" />

=== Supply-side vs. previous approaches to economic policy ===
Supply-side economics has originated as an alternative to Keynesian economics, which focused macroeconomic policy on management of final demand.<ref>{{Cite journal|last=Feldstein|first=Martin|date=January 1986|title=Supply Side Economics: Old Truths and New Claims|location=Cambridge, MA|doi=10.3386/w1792|s2cid=152585703|doi-access=free}}</ref> Demand-side economics relies on a fixed-price view of the economy, where the demand plays a key role in defining the future supply growth, which also allows for incentive implications of investment.<ref name=":3" />

The Keynesian policy approaches focus on demand management as a major instrument to affect aggregate production and GNP, while [[Finance:Monetarism|Monetarism]] focuses on management of monetary aggregates and credit. Unlike supply-side economics, demand-side economics is based on the assumption that increases in GNP result from increased spending.<ref name=":4">Son, Hyung Chan (1990). [http://hdl.handle.net/10945/34831 "Supply-side economics in the Republic of Korea"]. Monterey, California: Naval Postgraduate School.</ref>

Traditional policy approaches were challenged by the theory of supply-side economics in the Reagan Administration of the 1980s. It claims that fiscal policy may lead to changes in supply as well as in demand.<ref>Fink, Richeard H., ''Supply-Side Economics'', University Publications of America, 1982.</ref> So, when marginal tax rates are high, consumers pursue additional leisure and current consumption instead of pursuing current income and extra income in the future. Therefore, there is a decline in work effort and investment, which in turn causes a decrease of production and GNP, regardless of the total demand levels.

On these assumptions, supply side economists formulate the idea that a cut in marginal tax rates has a positive effect on economic growth.

=== Role of the marginal tax rates ===
The main focus of supply-side economics is promotion of economic growth. In this regard, some studies have suggested to consider two relative prices.

The first one influences decisions of individuals on the distribution of their income between consumption and savings.<ref name=":5">Roberts, Paul C., ''The Supply-Side Revolution'', Harvard University, 1984.</ref>{{rp|36}} The cost of individual's decision to assign a unit of income to either consumption or savings is a future value of the unit, which has been given up by choosing either to consume or to save. The unit of income value is defined by the marginal tax rates. Therefore, higher tax rates would decrease the cost of consumption, which would cause a fall in investment and savings. At the same time, lower tax rates would cause the investment and savings levels to rise, while the consumption levels would fall.<ref name=":4" />

The second price influences decisions of individuals on the distribution of their time between work and leisure.<ref name=":5" /> The cost of individual's decision to allocate a unit of time either to work or leisure stands for current income, which was given up by choosing either work or leisure. The cost also includes the future income, which was given up for leisure instead of enhancing the professional skills. The value of lost income is defined by the tax rate assigned to the additional income. Therefore, the increase in marginal tax rates leads to a decrease in the price of leisure. However, if the marginal tax rate decline, the cost of leisure increases.<ref name=":4" />

Both the amount of retained and taxed income is determined by the marginal tax rate.<ref name=":4" /> That is why, from a supply-side economist's standpoint, marginal tax rates play a significant role in determining the development of the economy. Due to crucial role in determining how much time workers will spend on work and leisure or how much income will be spent on consumption and for savings, supply-side economists insist on decreasing tax rates as they believe it could improve the growth rates of the economy.

=== Laffer curve ===
Laffer curve illustrates a mathematical relationship between tax revenues and tax rates, which was popularized by economist Arthur B. Laffer in 1974.<ref name=":4" /> Supply-side economics highly depends on the implications, which follow from the relationship presented by the curve. It shows that higher tax rates can sometimes decrease the tax base, which will lead to the decrease in tax revenues even if the tax rates are high.<ref name=":1" /> Due to the effect exerted by taxes on the taxed income, the adjustment of tax rates may not lead to proportional changes in tax revenues. That is why, some supply-side economists insist that the decreasing of too high tax rates can result in the increase of the tax revenues.

The [[Finance:Laffer curve|Laffer curve]] embodies a postulate of supply-side economics: that tax rates and tax revenues are distinct, with government tax revenues the same at a 100% tax rate as they are at a 0% tax rate and maximum revenue somewhere in between these two values. Supply-siders argued that in a high tax rate environment lowering tax rates would result in either increased revenues or smaller revenue losses than one would expect relying on only static estimates of the previous tax base.<ref name="Laffer, A.">{{cite web|last=Laffer|first=Arthur|date=June 1, 2004|title=The Laffer Curve, Past, Present and Future|url=http://www.heritage.org/Research/Taxes/bg1765.cfm|access-date=December 11, 2007|publisher=The Heritage Foundation|archive-date=December 1, 2007|archive-url=https://web.archive.org/web/20071201225944/http://www.heritage.org/Research/Taxes/bg1765.cfm|url-status=dead}}</ref><ref name="Bartlett">{{cite news|last=Bartlett|first=Bruce|date=April 6, 2007|title=How Supply-Side Economics Trickled Down|work={{wipe|The New York Times}}|url=https://www.nytimes.com/2007/04/06/opinion/06bartlett.html}}</ref>

This led supply-siders to advocate large reductions in marginal income and capital gains tax rates to encourage greater investment, which would produce more supply. Jude Wanniski and many others advocate a zero capital gains rate.<ref>Wanniski, Jude [http://www.polyconomics.com/index.php?option=com_content&view=article&id=1806:taxing-capital-gains&catid=52:2003&Itemid=31 "Taxing Capital Gains"]. {{webarchive|url=https://web.archive.org/web/20140502013505/http://www.polyconomics.com/index.php?option=com_content&view=article&id=1806%3Ataxing-capital-gains&catid=52%3A2003&Itemid=31|date=May 2, 2014}}</ref><ref>{{Cite web|first=Alan |last=Reynolds|date=July 1999|title=Capital gains tax: Analysis of reform options for Australia|url=http://www.asx.com.au/about/pdf/cgt.pdf|url-status=dead|archive-url=https://web.archive.org/web/20050718013109/http://www.asx.com.au/about/pdf/cgt.pdf|archive-date=July 18, 2005|publisher=Hudson Institute}}</ref> The increased aggregate supply should result in increased aggregate demand, hence the term "supply-side economics".

== History ==

=== Reaganomics ===
In the United States, commentators{{who|date=December 2021}} frequently equate supply-side economics with [[Finance:Reaganomics|Reaganomics]].{{citation needed|date=December 2021}} The administration of Republican president Ronald Reagan promoted its fiscal policies as being based on supply-side economics. Reagan made supply-side economics a household phrase and promised an across-the-board reduction in income tax rates and an even larger reduction in capital gains tax rates.<ref>(Karl Case and Ray Fair, 1999: pp. 781–2).</ref> During Reagan's 1980 presidential campaign, the key economic concern was double digit [[Finance:Inflation|inflation]], which Reagan described as "[t]oo many dollars chasing too few goods", but rather than the usual dose of tight money, recession and layoffs, with their consequent loss of production and wealth, he promised a gradual and painless way to fight inflation by "producing our way out of it".<ref>Case & Fair, pp. 781–2.</ref>

Switching from earlier monetary policy, [[Finance:Federal Reserve|Federal Reserve]] chair Paul Volcker implemented tighter monetary policies including lower money supply growth to break the [[Finance:Inflationary psychology|inflationary psychology]] and squeeze inflationary expectations out of the [[Finance:Economic system|economic system]].<ref>Malabre, Jr., pp. 170–1.</ref> Therefore, supply-side supporters argue that Reaganomics was only partially based on supply-side economics.{{citation needed|date=March 2021}}

Congress under Reagan passed a plan that would slash taxes by $749 billion over five years. Critics claim that the tax cuts increased budget deficits while Reagan supporters credit them with helping the 1980s economic expansion and argued that the budget deficit would have decreased if not for massive increases in military spending.{{better source needed|reason=CapX is a run by a conservative British think tank|date=March 2021}}<ref name="capx">{{cite web|date=June 22, 2017|title=Busting the Left's myths about Reaganomics|url=https://capx.co/busting-the-lefts-myths-about-reaganomics/|website=CapX}}</ref> As a result, Jason Hymowitz cited Reagan—along with Jack Kemp—as a great advocate for supply-side economics in politics and repeatedly praised his leadership.<ref>Malabre, Jr., p. 188.</ref>

Critics of Reaganomics claim it failed to produce much of the exaggerated gains some supply-siders had promised. [[Biography:Paul Krugman|Paul Krugman]] later summarized the situation: "When Ronald Reagan was elected, the supply-siders got a chance to try out their ideas. Unfortunately, they failed." Although he credited supply-side economics for being more successful than [[Finance:Monetarism|monetarism]] which he claimed "left the economy in ruins", he stated that supply-side economics produced results which fell "so far short of what it promised", describing the supply-side theory as "free lunches".<ref>Malabre, Jr., p. 195.</ref>

=== Clinton years ===
{{main|Finance:Economic policy of the Bill Clinton administration}}
[[File:Average US Federal Tax Rates 1979 to 2013.png|thumb|450px|The chart shows average federal tax rates paid by various levels of the income distribution. During the Clinton era, taxes on upper incomes were higher than during the Reagan era.<ref name="CBO 2013">{{cite web|date=December 4, 2013|title=The Distribution of Household Income and Federal Taxes, 2010|url=http://cbo.gov/publication/44604|access-date=January 6, 2014|publisher=The US Congressional Budget Office (CBO)}}</ref> Paul Krugman argued how higher taxes on higher income persons, combined with higher job creation under Clinton, represented a counter-example of the supply-side tax-cut doctrine.<ref name="Krugman_Zombies17">{{cite news|date=April 24, 2017|title=Zombies of Voodoo Economics|newspaper=nytimes.com|url=https://www.nytimes.com/2017/04/24/opinion/zombies-of-voodoo-economics.html|access-date=March 6, 2020}}</ref> Krugman linked his own version of this chart to the preceding article, illustrating the average tax rate of the top 1%.<ref name="Krugman_TwitterChart">{{cite web|date=April 22, 2017|title=Twitter post: Tax rate chart|url=https://twitter.com/paulkrugman/status/855902141751238657|access-date=March 6, 2020|publisher=Paul Krugman}}</ref>]]

Clinton signed the Omnibus Budget Reconciliation Act of 1993 into law, which raised income taxes rates on incomes above $115,000, created additional higher tax brackets for corporate income over $335,000, removed the cap on Medicare taxes, raised fuel taxes and increased the portion of Social Security income subject to tax, among other tax increases. Frankel and Orszag described the "progressive fiscal conservatism" of the 1993 package: "Such progressive fiscal conservatism combines modest attempts at redistribution (the progressive component) and budget discipline (the fiscal conservative component). Thus the 1993 package included significant spending reductions and tax increases. But it concentrated the tax increases on upper-income taxpayers, while substantially expanding the Earned Income Tax Credit, Head Start, and other government programs aimed at lower earners." The tax increases led to greater revenue (relative to a baseline without a tax increase).<ref name="CBO_1999">{{cite web|date=January 1999|title=The Economic and Budget Outlook: Fiscal years 2000-2009|url=https://www.cbo.gov/sites/default/files/106th-congress-1999-2000/reports/eb0199.pdf|website=cbo.gov}}</ref>

The bill was strongly opposed by Republicans, vigorously attacked by John Kasich and Minority Whip Newt Gingrich as destined to cause job losses and lower revenue.<ref name="Kornacki-2011">{{cite news|last1=Kornacki|first1=Steve|date=April 19, 2011|title=The decade the GOP hopes you've forgotten|agency=Salon|url=https://www.salon.com/2011/04/19/republicans_deficit_taxes/|access-date=December 22, 2018}}</ref>

Economist [[Biography:Paul Krugman|Paul Krugman]] wrote in 2017 that Clinton's tax increases on the rich provided counter-example to the supply-side tax cut doctrine: "Bill Clinton provided a clear test, by raising taxes on the rich. Republicans predicted disaster, but instead the economy boomed, creating more jobs than under Reagan."<ref name="Krugman_Zombies17" />

Supply-side economist Alan Reynolds argued that the Clinton era represented a continuation of a low tax policy (from the 1980s):{{blockquote|In reality, tax policy was not unambiguously better in the eighties than in the nineties. The highest income tax rate was 50 percent from 1983 to 1986, but below 40 percent after 1993. And the capital gains tax was 28 percent from 1987 to [1997], but only 20 percent in the booming years of 1997-2000. On balance, there were good and bad things about both periods. But both the eighties and the nineties had much wiser tax policies than we had from 1968 to 1982.<ref name="Supply Side Economics After 30 years">{{cite web|url=https://www.researchgate.net/publication/307578425 |title=Supply Side Economics After 30 years, Presentation at Vanderbilt University  |date=23 January 2003 |access-date=5 March 2020}}</ref>}}

===Kansas experiment===
{{main|Finance:Kansas experiment}}
In May 2012, [[Biography:Sam Brownback|Sam Brownback]], Governor of the state of {{wipe|Kansas}}, signed into law the "Kansas Senate Bill Substitute HB 2117",<ref name="HB2117">{{cite web|title=Senate Substitute for HB 2117 by Committee on Taxation -- Reduction of income tax rates for individuals and determination of income tax credits; severance tax exemptions; homestead property tax refunds; food sales tax refunds|url=http://www.kslegislature.org/li_2012/b2011_12/measures/hb2117/|access-date=October 29, 2014}}</ref><ref name="kansas.com">{{cite news|date=May 24, 2012|title=Kansas small-business owners say elimination of income tax is a big help|work=The Wichita Eagle|url=http://www.kansas.com/2012/05/24/2346375/kansas-small-business-owners-say.html|access-date=November 30, 2018|archive-date=December 30, 2013|archive-url=https://web.archive.org/web/20131230234642/http://www.kansas.com/2012/05/24/2346375/kansas-small-business-owners-say.html|url-status=dead}}</ref> which cut the number of individual income tax brackets from three to two, and cut the top income tax rates from 6.45% and 6.25% to 4.9% and the bottom rate from 3.5% to 3%.{{ r | WSJ_BB }}{{citation needed|reason=WSJ editorial by Brownback source supports half of these numbers; statement originally copied from [[Finance:Kansas experiment|Kansas experiment]]|date=March 2021}} It also eliminated the 7% tax on "pass-through" income, income that businesses — such as sole proprietorships, partnerships, limited liability companies, and [[Finance:S corporation|subchapter S corporations]] — pass on to their owners instead of paying corporate income tax on, for the owners of almost 200,000 businesses{{ r | kansas.com }}{{ r | npr_2017-10-25 |p=1 | q=A key part of the plan slashed to zero the tax rate pass-through businesses pay. Small businesses — such as sole proprietorships, partnerships and S corporations — pay taxes through the individual income tax code, not the corporate one. Under the Kansas plan, the pass-through tax rate was reduced from 7 percent to zero. }}{{r | KAKE.signs }} The law cut taxes by {{USD}}231 million in its first year, and cuts were projected to increase to {{USD}}934 million annually after six years.<ref name="KAKE.signs">{{cite web|title=Brownback Signs Tax Cuts Law In Statehouse Ceremony|url=http://www.kake.com/home/headlines/Brownback_To_Sign_Tax_Cuts_In_Statehouse_Ceremony_152569155.html|url-status=dead|archive-url=https://web.archive.org/web/20141029213649/http://www.kake.com/home/headlines/Brownback_To_Sign_Tax_Cuts_In_Statehouse_Ceremony_152569155.html|archive-date=October 29, 2014|access-date=October 29, 2014|publisher=KAKE News}}</ref><ref name="kc">{{cite web|author=Cooper, Brad|date=May 23, 2012|title=Brownback signs big tax cut in Kansas|url=http://www.kansascity.com/latest-news/article303137/Brownback-signs-big-tax-cut-in-Kansas.html|access-date=October 10, 2016|work=Kansas City Star}}</ref>

The cuts were based on model legislation published by the conservative American Legislative Exchange Council (ALEC),<ref name="ljworld">{{cite news|last=Rothschild|first=Scott|date=December 17, 2013|title=Brownback says perception of ALEC influence is 'overblown'|newspaper=Lawrence Journal-World|url=http://www2.ljworld.com/weblogs/capitol-report/2013/dec/17/brownback-says-perception-of-alec-influe/}}</ref><ref>{{cite news|last=Pilkington|first=Ed|date=November 20, 2013|title=Obamacare faces new threat at state level from corporate interest group Alec|work={{wipe|The Guardian}}|url=https://www.theguardian.com/world/2013/nov/20/obamacare-alec-republican-legislators}}</ref> and were supported by ''{{wipe|The Wall Street Journal}}'',{{citation needed|reason=he wrote an op-ed in the WSJ, but that doesn't mean they support his policies, though it is likely they do|date=March 2021}} supply-side economist Arthur Laffer,<ref name="nyt-barro">{{cite news|author=Josh Barro|date=June 27, 2014|title=Yes, if You Cut Taxes, You Get Less Tax Revenue|newspaper=The New York Times|url=https://www.nytimes.com/2014/06/29/upshot/kansas-tax-cut-leaves-brownback-with-less-money.html|access-date=September 2, 2014}}</ref> economics commentator Stephen Moore<ref>{{cite web | last=Lowry | first=Bryan | title=Stephen Moore, an adviser on Brownback's tax cuts, won't serve on Federal Reserve | website=The Kansas City Star | date=2 May 2019 | url=https://www.kansascity.com/news/local/news-columns-blogs/the-buzz/article229950669.html | access-date=30 July 2023}}</ref> and anti-tax leader Grover Norquist.<ref name="norquist">{{cite news|title=Norquist defends tax cuts despite Brownback woes in Kansas|newspaper=The Hill|url=http://thehill.com/policy/finance/218449-norquist-defends-tax-cuts-despite-brownback-woes|access-date=October 29, 2014}}</ref> The tax cuts have been called the "Kansas experiment",<ref name="npr_2017-10-25">{{cite news|last1=HOBSON|first1=JEREMY|last2=RUSSELL|first2=DEAN|last3=RAPHELSON|first3=SAMANTHA|date=October 25, 2017|title=As Trump Proposes Tax Cuts, Kansas Deals With Aftermath Of Experiment|agency=NPR|url=https://www.npr.org/2017/10/25/560040131/as-trump-proposes-tax-cuts-kansas-deals-with-aftermath-of-experiment | archive-url=https://web.archive.org/web/20171104230956/https://www.npr.org/2017/10/25/560040131/as-trump-proposes-tax-cuts-kansas-deals-with-aftermath-of-experiment | archive-date=2017-11-04 | url-status=live | quote=[Kenneth Kriz, a professor of public finance at Wichita State University, said] "Studies have shown that tax cuts tend to pay anywhere between 10 percent and 30 percent of their costs," he says. "So if we cut taxes by a trillion dollars, we're going to probably get an extra hundred billion back ... in extra revenues from economic growth. But that still leaves $700 [billion] to $900 billion in cuts that will have to be made. Those cuts also have an economic effect in drawing down the economy."}}</ref> and was described by the Brookings Institution as "one of the cleanest experiments for how tax cuts effect economic growth in the U.S."<ref name="gale">{{cite news|last1=Gale|first1=William G.|date=July 11, 2017|title=The Kansas tax cut experiment|publisher=Brookings Institution|url=https://www.brookings.edu/blog/unpacked/2017/07/11/the-kansas-tax-cut-experiment/|access-date=November 20, 2018}}</ref>

Brownback compared his tax cut policies with those of Ronald Reagan, but also described them as "a real live experiment ... We'll see how it works.",<ref name=WSJ_BB>{{cite news|last1=Brownback|first1=Sam|title=A Midwest Renaissance Rooted in the Reagan Formula|newspaper=Wall Street Journal|date=28 May 2014|url=https://online.wsj.com/articles/sam-brownback-a-midwest-renaissance-rooted-in-the-reagan-formula-1401317548|access-date=October 28, 2014}}</ref><ref name="ljworld.experiment">{{cite web|title=Brownback gets heat for 'real live experiment' comment on tax cuts|url=http://www2.ljworld.com/news/2012/jun/19/brownback-gets-heat-real-live-experiment-comment-t/|access-date=October 28, 2014|publisher=Lawrence Journal World}}</ref> Brownback forecast his cuts would create an additional 23,000 jobs in Kansas by 2020, and was intended to generate rapid economic growth, which he said would be "like a shot of adrenaline into the heart of the Kansas economy."<ref name="kansas.com" /><ref>{{Cite web|url=https://www.taxpolicycenter.org/taxvox/what-congressional-tax-cutters-can-learn-kansas|title=What Congressional Tax Cutters Can Learn From Kansas|date=November 29, 2017|website=Tax Policy Center}}</ref> On the other hand, the Kansas Legislature's research staff warned of the possibility of a deficit of nearly {{USD}}2.5 billion by July 2018.<ref name="KAKE.signs" />

By 2017, state revenues had fallen by hundreds of millions of dollars<ref name="fivethirtyeight">{{cite news|last1=Casselman|first1=Ben|last2=Koerth-Baker|first2=Maggie|last3=Barry-Jester|first3=Anna Maria|last4=Cheng|first4=Michelle|date=June 9, 2017|title=The Kansas Experiment Is Bad News For Trump's Tax Cuts|work=FiveThirtyEight|url=https://fivethirtyeight.com/features/the-kansas-experiment-is-bad-news-for-trumps-tax-cuts/|access-date=October 4, 2017}}</ref> 
causing spending on roads, bridges, and education to be slashed,<ref name="ks_legis_approves_2017_06_06_cjonline_com">[http://cjonline.com/news-state-government-local-state/2016-05-02/kansas-legislature-approves-budget-deal-after-lawmakers "Kansas Legislature approves budget deal, after lawmakers deliver blistering critiques of state finances,"] {{Webarchive|url=https://web.archive.org/web/20171004034640/http://cjonline.com/news-state-government-local-state/2016-05-02/kansas-legislature-approves-budget-deal-after-lawmakers|date=October 4, 2017}} May 2, 2016, ''Topeka Capital-Journal''</ref><ref name="ks_republicans_sour_2017_02_24_the_atlantic">[https://www.theatlantic.com/politics/archive/2017/02/the-republican-blowback-against-sam-brownback-kansas/517641/ "Kansas Republicans Sour on Their Tax-Cut Experiment"] February 24, 2017, ''The Atlantic''</ref> but instead of boosting economic growth, growth in Kansas remained consistently below average.<ref name="Gleckman">{{cite news|last1=Gleckman|first1=Howard|date=June 7, 2017|title=The Great Kansas Tax Cut Experiment Crashes And Burns|agency=Forbes|url=https://www.forbes.com/sites/beltway/2017/06/07/the-great-kansas-tax-cut-experiment-crashes-and-burns/#347b63e75508|access-date=November 20, 2018}}</ref> A working paper by two economists at Oklahoma State University (Dan Rickman and Hongbo Wang) using historical data from several other states with economies structured similarly to Kansas found that the Kansas economy grew about 7.8% less and employment about 2.6% less than it would have had Brownback not cut taxes.<ref name="gone-worse">{{cite news|last1=Ehrenfreund|first1=Max|date=June 15, 2017|title=Wonkblog. Kansas's conservative experiment may have gone worse than people thought|agency=Washington Post|url=https://www.washingtonpost.com/news/wonk/wp/2017/06/15/kansas-conservative-experiment-may-have-gone-worse-than-people-thought/|access-date=November 22, 2018}}</ref><ref name="2tales">{{cite web|last1=Rickman, Dan S.|first1=Dan S.|last2=Wang|first2=Hongbo|date=June 9, 2017|title=Two Tales of Two U.S. States: Regional Fiscal Austerity and Economic Performance|url=https://mpra.ub.uni-muenchen.de/79615/|access-date=November 22, 2018|website=Munich Personal RePEc Archive}}</ref>
In 2017, the Republican Legislature of Kansas voted to roll back the cuts, and after Brownback vetoed the repeal, overrode his veto.<ref name="deathof">{{cite news|last=Berman|first=Russell|date=June 7, 2017|title=The Death of Kansas's Conservative Experiment|work=The Atlantic|url=https://www.theatlantic.com/politics/archive/2017/06/kansass-conservative-tax-experiment-is-dead/529551/|access-date=June 7, 2017}}</ref>

According to Max Ehrenfreund, economists generally agree that an explanation for the reduction instead of increase in economic growth from the tax cuts is that "any" benefits from tax cuts come over the long, not short run, but what does come in the short run is a major decline in demand for goods and services. In the Kansas economy cuts in state government expenditures cut incomes of state government "employees, suppliers and contractors" who spent much or most of their incomes locally. In addition, concern over the state's large budget deficits "might have deterred businesses from making major new investments".<ref name="gone-worse" />

One problem Kansas encountered is that while studies have shown that tax cuts increase economic growth, the increased revenue from that growth at the new lower tax rates are only enough to make up for 10-30% of the tax cuts, meaning that to avoid deficits, spending cuts must also be made.{{ r | npr_2017-10-25 }}<ref name=WP_2017-06-07 >{{ cite news | url=https://www.washingtonpost.com/news/wonk/wp/2017/06/07/kansas-republicans-raise-taxes-rebuking-their-gop-governors-real-live-experiment-in-conservative-policy/ | title=Kansas Republicans raise taxes, ending their GOP governor's 'real live experiment' in conservative policy | last=Ehrenfreund | first=Max | newspaper={{wipe|The Washington Post}} | date=2017-06-08 | archive-url=https://web.archive.org/web/20171013114634/https://www.washingtonpost.com/news/wonk/wp/2017/06/07/kansas-republicans-raise-taxes-rebuking-their-gop-governors-real-live-experiment-in-conservative-policy/ | archive-date=2017-10-13 | url-status=live | quote=Yet red states such as Indiana and North Carolina have successfully reduced taxes while maintaining a balanced budget, said Joe Henchman, an attorney at the right-leaning Tax Foundation in Washington. They have done so by reducing spending sufficiently to make up for the difference. “They didn’t assume that the cuts would pay for themselves,” Henchman said. “It’s true that while tax cuts can boost economic activity, most tax cuts do not pay for themselves budgetarily.” }}</ref>

=== Trump years ===

Supply-side advocates Laffer and economics commentators Stephen Moore and Larry Kudlow played prominent roles in formulating Trump's economic policies by advising him on his tax cut, as well as encouraging him to lower trade barriers.<ref>{{Cite web|url=https://www.politico.com/magazine/story/2019/04/22/reagan-trump-economy-226704/|title=Reagan's Supply-Side Warriors Blaze a Comeback Under Trump|first=Ben|last=Schreckinger|website=POLITICO Magazine|date=22 April 2019 |quote=Members of the tight-knit group have shaped Trump’s signature tax cut, helped install each other in posts with vast influence over the global economy, and are working to channel Trump’s mercantilist instincts into pro-trade policies. ... The supply-siders began pushing Trump on trade, advising him to encourage a lowering of trade barriers on all sides, rather than raising them. Last June, Kudlow persuaded Trump to float the idea of the world governments eliminating all tariffs at a G-7 summit in Quebec. }}</ref> Laffer and Moore wrote a 2018 book about the policy, ''Trumponomics'', with a foreword by Kudlow. Economist Gregory Mankiw reviewed the book in ''Foreign Affairs'', and characterized the statements around Trump's policies as "snake-oil economics".{{ r | Mankiw_SO_1 | Mankiw_SO_2 }} He criticized the authors for un-apologetically parroting the president's claimed annual growth rates spawned by his tax cut to be 1-4%, when the highest reasonable estimates were around 0.5%, but also credits them for continuing to support the consensus view that free trade is good for all, against the president's mercantilist views.<ref name=Mankiw_SO_1>{{Cite magazine|url=https://www.foreignaffairs.com/reviews/review-essay/2018-12-11/snake-oil-economics|title=Snake-Oil Economics|journal=Foreign Affairs |date=March 25, 2019|issue=January/February 2019 |via=www.foreignaffairs.com |last1=Mankiw |first1=N. Gregory }}</ref><ref name=Mankiw_SO_2>{{cite web | url=https://scholar.harvard.edu/files/mankiw/files/snake-oil_economics.pdf | title=Snake-Oil Economics - The Bad Math Behind Trump's Policies | date=2019-02-01 | last=Mankiw | first=Gregory |  quote=One might reasonably argue that Trump’s tax cuts will increase growth over the next decade by as much as half a percentage point per year. But that is a long way from the one- to four-percentage-point boost that the president and his associates have bragged of, and that Moore and Laffer quote without explanation, caveat, or apology. }}</ref> He also criticized them for following a simplistic "economic growth will solve all problems" approach, when previous presidential economic advisors had been more nuanced, recognizing the unavoidable [[Finance:Optimal labor income taxation#Efficiency-Equity tradeoff|tradeoff between equity and efficiency]] in their approaches to managing the economy.{{ r | Mankiw_SO_2 }}

Trump implemented individual and corporate income tax cuts which took effect in 2018. Rutgers economics professor Farrokh Langdana claimed that the Trump tax cuts were an example of supply-side tax policy, citing a letter from economists long-associated with the supply-side theory describing them as such.<ref>{{cite web|title=Supply-side economic theory powers Trump tax plan|url=https://www.business.rutgers.edu/business-insights/supply-side-economic-theory-powers-trump-tax-plan|website=Rutgers Business School-Newark and New Brunswick|date=2 January 2018 }}</ref>

== Fiscal policy theory ==
One benefit of a supply-side policy is that shifting the aggregate supply curve outward means prices can be lowered along with expanding output and employment. This is in contrast to demand-side policies (e.g., higher government spending), which even if successful tend to create inflationary pressures (i.e., raise the aggregate price level) as the aggregate demand curve shifts outward. Infrastructure investment is an example of a policy that has both demand-side and supply-side elements.<ref name="Chiang_Macrotext"/>

Supply-side economics holds that increased taxation steadily reduces economic activity within a nation and discourages investment. Taxes act as a type of [[Finance:Trade barrier|trade barrier]] or [[Finance:Tariff|tariff]] that causes economic participants to revert to less efficient means of satisfying their needs. As such, higher taxation leads to lower levels of specialization and lower economic efficiency. The idea is said to be illustrated by the Laffer curve.<ref>(Karl Case and Ray Fair, 1999: pp. 780–1).</ref>

Supply-side economists have less to say on the effects of deficits and sometimes cite [[Biography:Robert Barro|Robert Barro]]'s work that states that rational economic actors will buy bonds in sufficient quantities to reduce long-term interest rates.<ref>{{cite web|url=http://www.treas.gov/offices/economic-policy/round_table_documents/2004/reynolds.pdf |title=The "Conventional" Hypothesis: Deficit Estimates, Savings Rates, Twin Deficits and Yield Curves |last=Reynolds |first=Alan |publisher=[[Organization:Cato Institute|Cato Institute]] |access-date=October 19, 2010 |url-status=dead |archive-url=https://web.archive.org/web/20090806212202/http://www.treas.gov/offices/economic-policy/round_table_documents/2004/reynolds.pdf |archive-date=August 6, 2009 }}</ref>

== Effect on economic growth and tax revenues ==
Bruce Bartlett stated in 2007 that "The original supply-siders suggested that some tax cuts, under very special circumstances, might actually raise federal revenues. ... But today it is common to hear tax cutters claim, implausibly, that all tax cuts raise revenue."<ref name="Bartlett" />

Some contemporary economists do not consider supply-side economics a tenable economic theory, with Alan Blinder calling it an "ill-fated" and perhaps "silly" school on the pages of a 2006 textbook.<ref name="Blinder">{{cite book |chapter=Can fiscal policy improve macro-stabilization |title=The macroeconomics of fiscal policy |last=Blinder |first=A. S. |editor=Kopcke, E. |editor2=Tootell, G. M. B. |editor3=Triest, R. K. |year=2006 |publisher=MIT Press |location=Cambridge, MA |isbn=0-262-11295-7 |pages=23–62 }}</ref> [[Biography:Greg Mankiw|Greg Mankiw]], former chairman of President President George W. Bush's Council of Economic Advisers, offered similarly sharp criticism of the school in the early editions of his introductory economics textbook. "Tax cuts rarely pay for themselves. My reading of the academic literature leads me to believe that about one-third of the cost of a typical tax cut is recouped with faster economic growth."<ref>{{cite news|url=https://www.nytimes.com/2017/06/02/upshot/a-tax-cut-might-be-nice-but-remember-the-deficit.html|title=A Tax Cut Might Be Nice. But Remember the Deficit.|first=N. Gregory|last=Mankiw|newspaper=The New York Times|date=June 2, 2017}}</ref>

In a 1992 article for the ''Harvard International Review'', [[Biography:James Tobin|James Tobin]] wrote: "The 'Laffer curve' idea that tax cuts would actually increase revenues turned out to deserve the ridicule."<ref name="Tobin">{{cite journal |last=Tobin |first=J. |year=1992 |title=Voodoo curse |journal=Harvard International Review |volume=14 |issue=4 |page=10 }}</ref>

Karl Case and Ray Fair wrote in ''Principles of Economics'', "The extreme promises of supply-side economics did not materialize. President Reagan argued that because of the effect depicted in the Laffer curve, the government could maintain expenditures, cut tax rates, and balance the budget. This was not the case. Government revenues fell sharply from levels that would have been realized without the tax cuts."<ref name="Case & Fair">{{cite book|last=Case|first=K. E.|title=Principles of Economics|author2=Fair, R. C.|publisher=Prentice Hall|year=2007|isbn=978-0-13-228914-6|edition=8th|location=Upper Saddle Rive, NJ}}</ref>

Supply side proponents Trabandt and Uhlig argue that "static scoring overestimates the revenue loss for labor and capital tax cuts" and that "[[Finance:Dynamic scoring|dynamic scoring]]" is a better predictor for the effects of tax cuts.<ref name="autogenerated2">{{Cite web|url=http://sfb649.wiwi.hu-berlin.de/papers/pdf/SFB649DP2006-023.pdf|title=Microsoft Word – SFB DP Frontpage.doc<!-- Bot generated title -->}}</ref>

A 1999 study by University of Chicago economist Austan Goolsbee examined major changes in high-income tax rates in the United States from the 1920s onwards. It concluded that there were only modest changes in the reported income of high-income individuals, indicating that the tax changes had little effect on how much people work.<ref name=":2">{{Cite journal|last=Goolsbee|first=Austan|date=1999|title=Evidence on the High-Income Laffer Curve from Six Decades of Tax Reform|journal=Brookings Papers on Economic Activity|volume=1999|issue=2|pages=1–64|doi=10.2307/2534678|jstor=2534678|issn=0007-2303|url=https://www.brookings.edu/wp-content/uploads/1999/06/1999b_bpea_goolsbee.pdf}}</ref><ref>{{Cite news|date=2015|title=A new crop of candidates discovers the father of supply side economics|newspaper=The Washington Post|url=https://www.washingtonpost.com/news/wonk/wp/2015/02/20/a-new-crop-of-candidates-discovers-the-father-of-supply-side-economics/}}</ref> He concluded that the notion that governments could raise more money by cutting rates "is unlikely to be true at anything like today's marginal tax rates."<ref name=":2" /> In 2015, one study found that in the past several decades, tax cuts in the U.S. seldom recouped revenue losses and had minimal impact on GDP growth.<ref>{{Cite news|last=Barro|first=Josh|date=March 17, 2015|title=Tax Cuts Still Don't Pay for Themselves|work=The New York Times|url=https://www.nytimes.com/2015/03/17/upshot/tax-cuts-still-dont-pay-for-themselves.html|access-date=August 26, 2016|issn=0362-4331}}</ref><ref name=":7">{{Citation|last1=Gale|first1=William G.|title=Effects of Income Tax Changes on Economic Growth|date=September 9, 2014|url=https://www.brookings.edu/wp-content/uploads/2016/06/09_Effects_Income_Tax_Changes_Economic_Growth_Gale_Samwick.pdf|publisher=Brookings Institution|access-date=August 26, 2016|last2=Samwick|first2=Andrew A.}}</ref>

A 2008 working paper found that in the case of Russia, "tax rate cuts can increase revenues by improving tax compliance."<ref name="PappTakats">{{cite journal|author1=Papp, TK|author2=Takáts, E|name-list-style=amp|title=Tax rate cuts and tax compliance—the Laffer curve revisited|url=http://www.imf.org/external/pubs/ft/wp/2008/wp0807.pdf|publisher=IMF Working Paper}}</ref>

''[[The New Palgrave Dictionary of Economics]]'' reports that estimates of revenue-maximizing tax rates have varied widely, with a [[Mid-range|mid-range]] of around 70%.<ref name="dictionaryofeconomics">{{cite book |doi=10.1057/9780230226203.0922 |chapter=Laffer curve |title=The New Palgrave Dictionary of Economics |url=https://archive.org/details/newpalgravedicti07blum |url-access=limited |year=2008 |last1=Fullerton |first1=Don |editor1-first=Steven N. |editor1-last=Durlauf |editor2-first=Lawrence E. |editor2-last=Blume |edition=2nd |isbn=978-0-333-78676-5 |page=[https://archive.org/details/newpalgravedicti07blum/page/n853 839] }}</ref>  According to a 2012 study, "the U.S. marginal top [tax] rate is far from the top of the Laffer curve."<ref>{{Cite journal|last1=Saez|first1=Emmanuel|last2=Slemrod|first2=Joel|last3=Giertz|first3=Seth H.|date=2012|title=The Elasticity of Taxable Income with Respect to Marginal Tax Rates: A Critical Review|journal=Journal of Economic Literature|volume=50|issue=1|pages=3–50|doi=10.1257/jel.50.1.3|jstor=23269968|s2cid=13169826|issn=0022-0515|url=https://digitalcommons.unl.edu/econfacpub/54}}</ref> A 2012 survey found a consensus among leading economists that reducing the US federal income tax rate would raise GDP but would not increase tax revenue.<ref name="booth">{{cite web|title=Laffer Curve|url=http://www.igmchicago.org/igm-economic-experts-panel/poll-results?SurveyID=SV_2irlrss5UC27YXi|access-date=June 15, 2015|website=IMG Forum|publisher=University of Chicago Booth School of Business}}</ref>

John Quiggin distinguishes between the Laffer curve and Laffer's analysis of tax rates. The Laffer curve was "correct but unoriginal", but Laffer's analysis that the United States was on the wrong side of the Laffer curve "was original but incorrect."<ref name=":32">{{Cite book|last=Quiggin|first=John|title=Zombie Economics|date=May 21, 2012|publisher=Princeton University Press|isbn=978-1-4008-4208-7|pages=142|doi=10.2307/j.ctt7rg7m}}</ref>

=== 1920s tax cuts ===

Proponents of supply-side economics have sometimes cited tax cuts enacted in the 1920s as evidence that tax cuts can increase tax revenue. After World War I, the highest tax bracket, which was for those earning over $100,000 a year (worth at least $1 million a year now), was over 70 percent.<ref>{{cite web |last=de Rugy |first=Veronique |date=March 4, 2003|title=1920s Income Tax Cuts Sparked Economic Growth and Raised Federal Revenues |url=https://www.cato.org/publications/commentary/1920s-income-tax-cuts-sparked-economic-growth-raised-federal-revenues |website=[[Organization:Cato Institute|Cato Institute]]}}</ref> According to [[Organization:The Heritage Foundation|The Heritage Foundation]], revenue acts of 1921, 1924 and 1926 reduced this [[Finance:Tax rate|tax rate]] to less than 25 percent, yet tax revenues actually went up significantly.<ref>{{cite web|last=Mitchell|first=Daniel|title=The Historical Lessons of Lower Tax Rates |url=https://www.heritage.org/node/18247/print-display |website=The Heritage Foundation}}</ref> Tax historian Joseph Thorndike argues that the tax cuts helped "bolster" growth but did not "cover the full cost of those tax cuts".<ref name=":0">{{Cite news |date=2017 |title=History lesson: Do big tax cuts pay for themselves? |newspaper=The Washington Post |url=https://www.washingtonpost.com/news/fact-checker/wp/2017/12/07/history-lesson-do-big-tax-cuts-pay-for-themselves/}}</ref>

=== Revenue Act of 1964 ===

Proponents of supply-side economics sometimes cite tax cuts enacted by President Lyndon B. Johnson with the Revenue Act of 1964. [[Biography:John F. Kennedy|John F. Kennedy]] had the year prior advocated a drastic tax-rate cut in 1963 when the top income tax rate was 91%, arguing that "[t]ax rates are too high today and tax revenues too low, and the soundest way to raise revenues in the long run is to cut rates now".<ref name="king-dollar-growth">{{cite web|date=September 16, 2016|title=Tax Cuts, King Dollar & Growth: From JFK to Reagan to Trump|website=National Review|url=https://www.nationalreview.com/2016/09/tax-cuts-king-dollar-and-growth-jfk-reagan-trump-economic-club-new-york/}}</ref> The CBO concluded in 1978 that the tax cuts reduced tax revenue by $12 billion and that only between $3 billion to $9 billion were recaptured due to bolstered economic growth. According to the CBO, "most of this rise [in revenues] was due to economic growth that would have taken place even without the tax cut."<ref name=":0" />

At the same time, some studies have found a relatively robust response to tax cuts from the top 5% of tax returns.<ref name=":6">Henderson, David R., Are We All Supply-Siders Now?, Western Economic Association International, 1989.</ref> There has been identified an increase of 7.7% in revenues from the top 5%, from $17.17 billion US in 1963 to $18.49 billion in 1965. Hereby, the data have provided evidence that the group has been in the prohibitive part of the Laffer curve, because its input to total tax revenues have increased despite the tax rates decreasing significantly.<ref name=":6" />

=== Reaganomics ===
{{main|Finance:Reaganomics}}
[[File:President Ronald Reagan addresses the nation from the Oval Office on tax reduction legislation.jpg|thumb|Ronald Reagan gives a televised address from the Oval Office, outlining his plan for tax reductions in July 1981]]
Supply-siders justified Reagan's tax cuts during the 1980s by claiming they would result in net increases in tax revenue, yet tax revenues declined (relative to a baseline without the cuts) due to Reagan's tax cuts, and the deficit ballooned during Reagan's term in office.<ref>{{Cite news|title=Can countries lower taxes and raise revenues?|newspaper=The Economist|url=https://www.economist.com/graphic-detail/2019/06/19/can-countries-lower-taxes-and-raise-revenues|access-date=June 13, 2020|issn=0013-0613}}</ref><ref>{{Cite web|date=December 4, 2017|title=How the GOP tax overhaul compares to the Reagan-era tax bills|url=https://www.pbs.org/newshour/economy/making-sense/how-the-gop-tax-overhaul-compares-to-the-reagan-era-tax-bills|access-date=June 13, 2020|website=PBS NewsHour|language=en-us}}</ref><ref>{{Cite news|title=How Reagan's Tax Cuts Fared|url=https://www.npr.org/2017/12/08/569345901/how-reagans-tax-cuts-fared|access-date=June 14, 2020|website=NPR.org|language=en}}</ref><ref>{{Cite journal|last=Narizny|first=Kevin|date=2003|title=Both Guns and Butter, or Neither: Class Interests in the Political Economy of Rearmament|url=https://www.cambridge.org/core/journals/american-political-science-review/article/both-guns-and-butter-or-neither-class-interests-in-the-political-economy-of-rearmament/B11F957D572F1776B1857ED2E76AF433|journal=American Political Science Review|language=en|volume=97|issue=2|pages=203–220|doi=10.1017/S0003055403000625|s2cid=7487941|issn=1537-5943|quote=[Reagan] proposed a new paradigm, supply-side economics, that promised to increase revenue by decreasing taxes (Hibbs 1987, 280–87, 296– 326). Despite its questionable logic, the sheer novelty of the idea gave Reagan greater leeway in budgetary politics than the public normally would have accepted (Modigliani and Modigliani 1987; Peterson 1985)... He had only a brief window of opportunity before supply-side economics was discredited by staggering budget deficits}}</ref> The Treasury Department studied the Reagan tax cuts and concluded they significantly reduced tax revenues relative to a baseline without them.<ref name="taxtable">{{cite journal|author=Treasury Department|date=September 2006|orig-year=2003|title=Revenue Effects of Major Tax Bills|url=https://www.treasury.gov/resource-center/tax-policy/tax-analysis/Documents/WP-81.pdf|publisher=United States Department of the Treasury|id=Working Paper 81, Table 2|access-date=November 28, 2007}}</ref> The 1990 budget by the Reagan administration concluded that the 1981 tax cuts had caused a reduction in tax revenue.<ref name=":0" />

Both CBO and the Reagan Administration forecast that individual and business income tax revenues would be lower if the Reagan tax cut proposals were implemented, relative to a policy baseline without those cuts, by about $50 billion in 1982 and $210 billion by 1986.<ref>{{cite web|date=March 25, 1981|title=An Analysis of President Reagan's Budget Revisions for Fiscal Year 1982-See Table 4|url=https://www.cbo.gov/sites/default/files/97th-congress-1981-1982/reports/81doc11b.pdf|website=cbo.gov}}</ref> FICA tax revenue increased because in 1983 FICA tax rates were increased from 6.7% to 7% and the ceiling was raised by $2,100. For the self-employed, the FICA tax rate went from 9.35% to 14%.<ref>{{cite web|title=Annual maximum taxable earnings and contribution rates|url=http://www.ssa.gov/history/pdf/t2a3.pdf|publisher=Social Security Administration}}</ref> The FICA tax rate increased throughout Reagan's term and rose to 7.51% in 1988 and the ceiling was raised by 61% through Reagan's two terms. Those tax hikes on wage earners, along with inflation, were the source of revenue gains in the early 1980s.<ref>[http://www.house.gov/jec/fiscal/tx-grwth/reagtxct/reagtxct.htm The Reagan Tax Cuts: Lessons for Tax Reform] – Joint Economic Committee {{webarchive|url=https://web.archive.org/web/20090226201115/http://www.house.gov/jec/fiscal/tx-grwth/reagtxct/reagtxct.htm|date=February 26, 2009}}</ref>

It has been contended by some supply-side critics that the argument to lower taxes to increase revenues was a smokescreen for "starving" the government of revenues in the hope that the tax cuts would lead to a corresponding drop in government spending, but this did not turn out to be the case. [[Biography:Paul Samuelson|Paul Samuelson]] called this notion "the tape worm theory—the idea that the way to get rid of a tape worm is [to] stab your patient in the stomach".<ref>Malabre, Jr., pp. 197–8.</ref>

There is frequent confusion on the meaning of the term "supply-side economics" between the related ideas of the existence of the Laffer Curve and the belief that decreasing tax rates can increase tax revenues. Many supply-side economists doubt the latter claim while still supporting the general policy of tax cuts. Economist Gregory Mankiw used the term "fad economics" to describe the notion of tax rate cuts increasing revenue in the third edition of his 2007 ''Principles of Macroeconomics'' textbook in a section entitled "Charlatans and Cranks": {{blockquote|An example of fad economics occurred in 1980, when a small group of economists advised Presidential candidate, Ronald Reagan, that an across-the-board cut in income tax rates would raise tax revenue. They argued that if people could keep a higher fraction of their income, people would work harder to earn more income. Even though tax rates would be lower, income would rise by so much, they claimed, that tax revenues would rise. Almost all professional economists, including most of those who supported Reagan's proposal to cut taxes, viewed this outcome as far too optimistic. Lower tax rates might encourage people to work harder and this extra effort would offset the direct effects of lower tax rates to some extent, but there was no credible evidence that work effort would rise by enough to cause tax revenues to rise in the face of lower tax rates. [...] People on fad diets put their health at risk but rarely achieve the permanent weight loss they desire. Similarly, when politicians rely on the advice of charlatans and cranks, they rarely get the desirable results they anticipate. After Reagan's election, Congress passed the cut in tax rates that Reagan advocated, but the tax cut did not cause tax revenues to rise.<ref>{{cite news |first=Noam |last=Scheiber |title=Can Greg Mankiw Survive Politics? |url=http://ksghome.harvard.edu/~jfrankel/TNR%20Online%20%20Mankiw%20Out%20of%20Depth.htm |magazine=The New Republic |date=2004-04-08 |url-status=dead |archive-url=https://web.archive.org/web/20080423012207/http://ksghome.harvard.edu/~jfrankel/TNR%20Online%20%20Mankiw%20Out%20of%20Depth.htm |archive-date=2008-04-23 }}</ref><ref>{{cite news |first=Stephen |last=Moore |title=Think Twice About Gregory Mankiw |url=http://www.nationalreview.com/moore/moore022803b.asp |work=National Review |date=February 28, 2003 }}</ref>|sign=|source=}}

In 1986, [[Biography:Martin Feldstein|Martin Feldstein]] — a self-described "traditional supply sider" who served as Reagan's chairman of the Council of Economic Advisors from 1982 to 1984 — characterized the "new supply siders" who emerged circa 1980:

<blockquote>What distinguished the new supply siders from the traditional supply siders as the 1980s began was not the policies they advocated but the claims that they made for those policies ... The "new" supply siders were much more extravagant in their claims. They projected rapid growth, dramatic increases in tax revenue, a sharp rise in saving, and a relatively painless reduction in inflation. The height of supply side hyperbole was the "Laffer curve" proposition that the tax cut would actually increase tax revenue because it would unleash an enormously depressed supply of effort. Another remarkable proposition was the claim that even if the tax cuts did lead to an increased budget deficit, that would not reduce the funds available for investment in plant and equipment because tax changes would raise the saving rate by enough to finance the increased deficit ... Nevertheless, I have no doubt that the loose talk of the supply side extremists gave fundamentally good policies a bad name and led to quantitative mistakes that not only contributed to subsequent budget deficits but that also made it more difficult to modify policy when those deficits became apparent.<ref>{{cite journal | last=Feldstein | first=Martin | title=Supply Side Economics: Old Truths and New Claims | journal=The American Economic Review |doi=10.3386/w1792 | volume=76 | issue=2 | year=1986 | issn=0002-8282 | jstor=1818729 | pages=26–30 | s2cid=152585703 | url=http://www.jstor.org/stable/1818729}}</ref></blockquote>

=== Bush tax cuts ===
During his presidency, President Bush signed the Economic Growth and Tax Relief Reconciliation Act of 2001 and Jobs and Growth Tax Relief Reconciliation Act of 2003, which entailed significant tax cuts. In 2003, the Congressional Budget Office conducted a dynamic scoring analysis of tax cuts advocated by supply advocates, and found that the Bush tax cuts would not pay for themselves. Two of the nine models used in the study predicted a large improvement in the deficit over the next ten years resulting from tax cuts, but only by making the assumption that people would work harder from 2004 to 2014 because they believed that tax rates would increase again in 2014, and they wanted to make more money before the tax cuts expired.<ref name="Dynamic 2003">`Dynamic' Scoring Finally Ends Debate On Taxes, Revenue. By Alan Murray. Wall Street Journal. (Eastern edition). New York, N.Y.: April 1, 2003. p. A.4</ref>

In 2006, the CBO released a study titled "A Dynamic Analysis of Permanent Extension of the President's Tax Relief".<ref>{{Cite web|url=http://www.ustreas.gov/press/releases/reports/treasurydynamicanalysisreporjjuly252006.pdf|archiveurl=https://web.archive.org/web/20070714004710/http://www.ustreas.gov/press/releases/reports/treasurydynamicanalysisreporjjuly252006.pdf|url-status=dead|title=Microsoft Word – treasury dyn anal report jul 24 10am II FINAL.doc<!-- Bot generated title -->|archive-date=July 14, 2007}}</ref> This study found that under the best possible scenario making tax cuts permanent would increase the economy "over the long run" by 0.7%. This study was criticized by many economists, including Harvard Economics Professor Greg Mankiw, who pointed out that the CBO used a very low value for the earnings-weighted compensated labor supply elasticity of 0.14.<ref>{{Cite web|url=http://gregmankiw.blogspot.com/2007/04/cbo-on-supply-side-economics.html|title=Greg Mankiw's Blog: CBO on Supply-side Economics|access-date=30 July 2023}}</ref> In a paper published in the Journal of Public Economics, Mankiw and Matthew Weinzierl noted that the current economics research would place an appropriate value for labor supply elasticity at around 0.5.<ref>{{cite journal|title=Journal of Public Economics : Dynamic scoring: A back-of-the-envelope guide|url=http://www.nber.org/papers/w11000.pdf|journal=Journal of Public Economics|volume=90|pages=1415–1433|doi=10.1016/j.jpubeco.2005.11.006}}</ref>

The [[Organization:Congressional Budget Office|Congressional Budget Office]] (CBO) estimated that extending the Bush tax cuts beyond their 2010 expiration would increase the deficit by $1.8 trillion over 10 years.<ref>{{cite web|date=March 21, 2007|title=An Analysis of the President's Budgetary Proposals for Fiscal Year 2008|url=http://www.cbo.gov/ftpdocs/78xx/doc7878/03-21-PresidentsBudget.pdf}}</ref> The CBO also completed a study in 2005 analyzing a hypothetical 10% income tax cut and concluded that under various scenarios there would be minimal offsets to the loss of revenue. In other words, deficits would increase by nearly the same amount as the tax cut in the first five years with limited feedback revenue thereafter.<ref>{{cite web|date=December 1, 2005|title=Analyzing the Economic and Budgetary Effects of a 10 Percent Cut in Income Tax Rates|url=http://www.cbo.gov/ftpdocs/69xx/doc6908/12-01-10PercentTaxCut.pdf}}</ref>

Nobel laureate economist [[Biography:Milton Friedman|Milton Friedman]] agreed the tax cuts would reduce tax revenues and result in intolerable deficits, though he supported them as a means to restrain federal spending.<ref>{{cite news|last=Friedman|first=Milton|date=January 15, 2003|title=What Every American Wants|newspaper=Wall Street Journal|url=https://www.wsj.com/articles/SB1042593796704188064}}</ref> Friedman characterized the reduced government tax revenue as "cutting their allowance".

Douglas Holtz-Eakin was a Bush administration economist who was appointed director of the [[Organization:Congressional Budget Office|Congressional Budget Office]] in 2003. Under his leadership, the CBO undertook a study of income tax rates which found that any new revenue from tax cuts paled in comparison to their cost.<ref>{{Cite news|url=https://www.nytimes.com/2008/04/23/business/23leonhardt.html|title=Weighing a McCain Economist (Published 2008)|first=David|last=Leonhardt|newspaper=The New York Times|date=April 23, 2008}}</ref><ref>{{cite web | title=Analyzing the Economic and Budgetary Effects of a 10 Percent Cut in Income Tax Rates | website=Congressional Budget Office | date=1 December 2005 | url=https://www.cbo.gov/publication/17507 | access-date=30 July 2023}}</ref><ref>{{Cite web|url=https://thehill.com/homenews/news/10504-holtz-eakin-to-leave-cbo|title=Holtz-Eakin to leave CBO|first=Elana|last=Schor|date=November 15, 2005|website=TheHill}}</ref>

Dartmouth economics professor Andrew Samwick was the chief staff economist for the Bush Council of Economic Advisers from July 2003 to July 2004. Writing on his blog in 2007, Samwick urged his former colleagues in the Bush administration to avoid asserting that the Bush tax cuts paid for themselves, because "No thoughtful person believes it...Not a single one."<ref>{{Cite web|url=http://voxbaby.blogspot.com/2007/01/new-years-plea.html|title=A New Year's Plea|access-date=30 July 2023}}</ref>

=== Trump tax cuts ===
''The New York Times'' reported in November 2018 that the Trump tax overhaul "has fattened the paychecks of most American workers, padded the profits of large corporations and sped economic growth." Cautioning that "its still early but ten months after the law took effect, the promised 'supply side' bump is harder to find than the sugar-high stimulus." The writers explained that "It's highly unusual for deficits...to grow this much during periods of prosperity" and that "the fiscal health of the U.S. is deteriorating fast, as revenues have declined sharply" (nearly $200 billion or about 6%) relative to the CBO forecast prior to the tax cuts. Results for 2018 included:
*Contrary to claims the tax cuts would pay for themselves, the budget deficit rose to $779 billion in fiscal year 2018, up 17% versus the prior year.
*Corporate tax revenues were down by one-third in fiscal year 2018.
*Stock buyback activity increased significantly.
*GDP growth, business investment and corporate profits increased.
*A typical worker in a large company got a $225 raise or one-time bonus, due to the law.
*Real wage growth (adjusted for inflation) was slightly slower in 2018 than 2017.<ref>{{cite news|last1=Tankersley|first1=Jim|last2=Phillips|first2=Matt|date=November 12, 2018|title=Trump's Tax Cut Was Supposed to Change Corporate Behavior. Here's What Happened.|newspaper=The New York Times|url=https://www.nytimes.com/2018/11/12/business/economy/trumps-tax-cut-was-supposed-to-change-corporate-behavior-heres-what-happened.html}}</ref>

Analysis conducted by the [[Social:Congressional Research Service|Congressional Research Service]] on the first-year effect of the tax cut found that little if any economic growth in 2018 could be attributed to it.<ref>{{Cite web|url=https://www.cnbc.com/2019/05/29/trump-tax-cuts-did-little-to-boost-economic-growth-in-2018-study-says.html|title = Trump tax cuts did little to boost economic growth in 2018, study says|website = {{wipe|CNBC}}|date = 29 May 2019}}</ref><ref>{{Cite web|url=https://thehill.com/policy/finance/445830-tax-law-had-small-effect-on-economy-wages-study|title = Trump's tax law had small effect on economy, wages: Study|date = 28 May 2019}}</ref> Growth in GDP, employment, worker compensation and business investment slowed during the second year following enactment of the tax cut, prior to the emergence of the COVID-19 pandemic.<ref>{{Cite news|url=https://www.reuters.com/article/us-usa-economy-idUSKBN1ZT0CA|title=U.S. economy misses Trump's 3% growth target in 2019|first=Lucia|last=Mutikani|newspaper=Reuters|date=January 30, 2020|via=www.reuters.com}}</ref><ref>{{Cite web|url=https://www.cnbc.com/2020/01/10/us-nonfarm-payrolls-december-2019.html|title=Job market ends 2019 with disappointing 145,000 growth in payrolls|first=Jeff|last=Cox|date=January 10, 2020|website=CNBC}}</ref><ref>{{Cite web|url=https://apnews.com/article/47d4485414dc41f3a51717a6e7188659|title=US workers' compensation growth slowed a bit in 2019|date=January 31, 2020|website=AP NEWS}}</ref>

Following the Trump tax cut, top White House economic advisor Larry Kudlow falsely asserted that federal revenues had increased about 10% since the tax cut, though they had actually declined.<ref>{{Cite web|url=https://www.factcheck.org/2019/03/larry-kudlows-revenue-deception/|title=Larry Kudlow's Revenue Deception|first=Eugene|last=Kiely|date=March 12, 2019}}</ref> He also falsely asserted that the [[Organization:Congressional Budget Office|CBO]] had found the "entire $1.5 trillion tax cut is virtually paid for by higher revenues and better nominal GDP."<ref>{{Cite web|url=https://www.usatoday.com/story/news/politics/2018/08/02/cbo-didnt-say-tax-cuts-were-virtually-paid-larry-kudlow-fact-check/895004002/|title=Fact check: CBO didn't say tax cuts were 'virtually paid for'|first=D'Angelo|last=Gore|website=USA TODAY}}</ref><ref>{{Cite web|url=https://www.washingtonpost.com/politics/2019/03/14/larry-kudlows-claim-that-we-have-virtually-paid-trumps-tax-cut/|title=Analysis &#124; Larry Kudlow's claim that 'we have virtually paid for' Trump's tax cut|first=Salvador|last=Rizzo|via=www.washingtonpost.com}}</ref><ref>{{Cite news|url=https://www.bloomberg.com/news/articles/2019-04-11/kudlow-says-trump-s-tax-cuts-already-paying-for-themselves|title=Defying Data, Kudlow Says Trump's Tax Cuts Covering Their Costs|newspaper=Bloomberg.com|date=April 11, 2019|via=www.bloomberg.com}}</ref>

=== China's Supply-side Structural Reform ===
Beginning in 2012, China's economic performance entered a "new normal," in which the growth of the economy slowed to a medium pace for the first time since the broad economic reforms of [[Biography:Deng Xiaoping|Deng Xiaoping]]. In response, Chinese President [[Biography:Xi Jinping|Xi Jinping]] announced supply-side structural reforms (SSSR) in 2015 in an effort to combat the slowing economic growth, moving away from the export-oriented economy and toward supply and production driven growth.<ref>{{cite journal |last1=Wang |first1=Hai |title=Exploring the Development Path of Supply-side Structural Reform of Sports Industry Under the New Normal |journal=Advances in Economics, Business and Management Research |date=2018 |volume=70 |pages=312–316 |url=https://www.atlantis-press.com/article/25905650.pdf}}</ref> The focus of the reforms correspond to increase in [[Finance:Total factor productivity|total factor productivity]] (TFP) through an increase in investment in technological improvements as a replacement for the labor and capital-intensive emphasis of the previous growth model.<br>
<br>China's supply-side structural reforms focus on the reduction of excess capacity across various economic sectors. The reform plan centers around four key areas: cutting excess industrial capacity, reducing leverage in the corporate sector, reducing stock of property inventories, and lowering costs for new enterprises.<ref name="Reserve Bank of Australia">{{cite web |last1=Boulter |first1=John |title=China's Supply-side Structural Reform |date=13 December 2018 |url=https://www.rba.gov.au/publications/bulletin/2018/dec/chinas-supply-side-structural-reform.html |publisher=Reserve Bank of Australia |access-date=25 April 2023}}</ref> The former two areas corresponds to short-term initiatives related to the state-owned sectors, while the former initiatives correspond to longer-term solutions within the private sector.<ref>{{cite journal |last1=Hyun |first1=Sungbaek |last2=Park |first2=Minsuk |last3=Park |first3=Jinhee |last4=Cho |first4=Ko Un |last5=Jin |first5=Furong |title=Evaluation and Implications of China's Supply-side Structural Reform |journal=World Economy Brief |date=July 15, 2019 |volume=9 |issue=15 |url=https://www.think-asia.org/handle/11540/10942}}</ref> Cutting excess industrial capacity focuses heavily on sectors like [[Earth:Coal|coal]], steel, and [[Physics:Electricity|electricity]] generation. The targets for coal production reductions implemented by the [[Finance:National Development and Reform Commission|National Development and Reform Commission]] (NDRC) amounted to 250 million tonnes per annum (Mta) in 2016 as well as a 100-150 Mta reduction in steel production capacity over a five-year period.<ref name="Reserve Bank of Australia"/> The result in the steel industry was more pricing power for the remaining large firms, as well as higher profits due to the increase in price. The increase in profits due to excess capacity reductions has also led to an increased capacity of firms to settle outstanding debts and reduce leverage, part of the second pillar of China's SSSR. As part of the deleveraging initiative, the government also encouraged [[Social:Mergers and acquisitions|mergers and acquisitions]], direct financing, and debt-to-equity swaps, resulting in the stabilization of corporate debt to GDP ratio. Additional reforms include increased incentives for private sector investment, development of modern service industries, and increasing public goods and services supply.<ref name="Reserve Bank of Australia"/> The longer-term initiatives have also been accompanied by large-scale tax cuts as well as a transition from business tax to [[Finance:Value-added tax|value-added tax]] (VAT) which produced positive results for service industry growth. Policies targeted toward new growth engine creation include Made in China 2025 and the Internet Plus agenda, both of which have been attributed in part to the rapid growth of China's industrial and innovation competitiveness.<br>
<br>China's supply-side structural reforms are ongoing and oriented toward the long term. The adjustments to the industrial sector as a result of the early reform policies have been attributed to a nominal increase in [[Finance:GDP|GDP]] growth. However, the economic effects of the COVID-19 pandemic impacted demand growth in China's domestic consumer market, which has slowed the effects of continued supply-side reforms.<ref>{{cite web |title=Supply-side reform gets greater boost | url=https://www.chinatax.gov.cn/eng/c101269/c5168519/content.html | publisher=State Taxation Administration of the People's Republic of China |access-date=26 April 2023}}</ref>

== Housing supply and prices ==
{{multiple image
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 | image1 = Newly Constructed Houses Sold Per Month By Metro Area.webp
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 | alt1 = Newly Constructed Houses Sold Per Month By Metro Area
 | link1 = https://commons.wikimedia.org/wiki/File:Newly_Constructed_Houses_Sold_Per_Month_By_Metro_Area.webp#/media/File:Newly_Constructed_Houses_Sold_Per_Month_By_Metro_Area.webp
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 | caption2  = Median housing price by metro area
}}

Increasing the supply of housing is a way to drive down prices, in contrast to demand-side economics which believes in subsidizing buyers or reducing demand with [[Finance:Quantitative tightening|tight monetary policy]].<ref>https://www.investopedia.com/ask/answers/040215/how-does-law-supply-and-demand-affect-housing-market.asp</ref><ref>https://www.bis.org/publ/bppdf/bispap88_keynote.pdf</ref>


== Effect on income inequality ==
Income inequality can be measured both pre- and after-tax. There is no consensus on the effects of income tax cuts on pre-tax income inequality, although one 2013 study indicated a strong correlation between how much top marginal tax rates were cut and greater pre-tax inequality across many countries.<ref>{{cite web|url=https://www.theatlantic.com/business/archive/2013/05/study-tax-cuts-might-drive-income-inequality-after-all/276394/|title=Study: Tax Cuts Might Drive Income Inequality After All|first=Jordan|last=Weissmann|date=May 30, 2013|website=The Atlantic}}</ref>

For example, the Tax Policy Center evaluated a detailed supply-side tax cut proposal from presidential candidate Jeb Bush in 2015. Their conclusion was that the proposal would both increase deficits dramatically and worsen after-tax income inequality.<ref>{{Cite web|url=https://www.washingtonpost.com/posteverything/wp/2015/12/11/its-official-the-bush-tax-plan-loses-trillions-and-worsens-inequality/|title=It's official: The Bush tax plan loses trillions and worsens inequality|first=Jared|last=Bernstein|via=www.washingtonpost.com}}</ref>

== Criticism ==
[[File:Changes Top 1% Share and Top Marginal Tax Rate v2.jpg|thumb|upright=1.0|Supply side economics has been criticised for benefiting high income earners, as graph shows the change in top 1% income share against the change in top income tax rate from 1975–1979 to 2004–2008 for 18 OECD countries: the correlation between increasing income inequality and decreasing top tax rates is very strong<ref>[http://www.economicdynamics.org/meetpapers/2012/paper_78.pdf Optimal Taxation of Top Labor Incomes: A Tale of Three Elasticities] Thomas Piketty, Emmanuel Saez, Stefanie Stantcheva, NBER, Nov. 2011</ref>]]
Critics of supply-side policies emphasize the growing federal deficits, increased income inequality and lack of growth.<ref name="Orzsag">{{cite web |url=http://www.brookings.edu/research/opinions/2003/05/09taxes-gale|author1=Gale, W. G.  |author2=Orszag, P. R.  |name-list-style=amp |title=Bush's Tax Plan Slashes Growth |date=May 9, 2003 |publisher=The Brookings Institution |access-date=October 23, 2007 }}</ref> They argue that the Laffer curve only measures the rate of taxation, not tax incidence, which may be a stronger predictor of whether a tax code change is stimulative or dampening.<ref>{{cite journal|last1=Holter|title=How Does Tax Progressivity and Household Heterogeneity Affect Laffer Curves?|date=November 2014|url=http://economics.sas.upenn.edu/~dkrueger/research/LafferCurves.pdf|access-date=July 29, 2015|series=Penn Institute for Economic Research|publisher=Centre for Economic Policy Research|display-authors=0}}</ref>

Writing in 2010, John Quiggin said, "To the extent that there was an economic response to the Reagan tax cuts, and to those of George W. Bush twenty years later, it seems largely to have been a Keynesian demand-side response, to be expected when governments provide households with additional net income in the context of a depressed economy."<ref name=":32"/>

Cutting marginal tax rates can also be perceived as primarily beneficial to the wealthy, which some see as politically rather than economically motivated:<ref>{{cite news |first=Paul |last=Krugman |title=The Tax Cut Zombies |url=https://www.nytimes.com/2005/12/23/opinion/the-taxcut-zombies.html |work={{wipe|The New York Times}} |date=December 23, 2005 }}</ref>

{{blockquote|Back in 1980 George H. W. Bush famously described supply-side economics — the claim that cutting taxes on rich people will conjure up an economic miracle, so much so that revenues will actually rise — as "voodoo economic policy." Yet it soon became the official doctrine of the Republican Party, and still is. That shows an impressive level of commitment. But what makes this commitment even more impressive is that it's a doctrine that has been tested again and again — and has failed every time...In other words, supply-side economics is a classic example of a zombie doctrine: a view that should have been killed by the evidence long ago, but just keeps shambling along, eating politicians' brains. <br />— [[Biography:Paul Krugman|Paul Krugman]]<ref>{{Cite news|url=https://www.nytimes.com/2017/04/24/opinion/zombies-of-voodoo-economics.html|title=Opinion &#124; Zombies of Voodoo Economics (Published 2017)|first=Paul|last=Krugman|newspaper=The New York Times|date=April 24, 2017}}</ref>}}

{{blockquote|Mr. David Stockman has said that supply-side economics was merely a cover for the trickle-down approach to economic policy—what an older and less elegant generation called the horse-and-sparrow theory: If you feed the horse enough oats, some will pass through to the road for the sparrows.<br />— John Kenneth Galbraith<ref>{{cite news |first=John Kenneth |last=Galbraith |title=Recession Economics |url=http://www.nybooks.com/articles/6735 |work=New York Review of Books |date=1982-02-04 }}</ref>|sign=|source=}}Studies, which have analysed the tax cuts in 2001 (EGTRRA), provided controversial conclusions: the decrease in taxes have provided a generally positive impact on the future output from the effect of the lower tax rates on human [[Finance:Capital accumulation|capital accumulation]], private saving and investment, labor supply; however, the tax cuts have produced adverse effects such as higher deficits and reduced national savings.<ref name=":7" /> Thus, Gale and Potter (2002) concluded that these tax cuts could not affect the GDP levels in any significant way in the next 10 years.<ref>Gale, William G., and Samara Potter. 2002. “An Economic Evaluation of the Economic Growth and Tax Relief Reconciliation Act.” National Tax Journal 55 (1): 133-86.</ref>

== See also ==
{{div col}}
* {{Annotated link |Austerity}}
* {{Annotated link |Demand-side economics}}
* {{Annotated link |Fiscal conservatism}}
* {{Annotated link |Gold standard}}
* {{Annotated link |Mellonomics}}
* {{Annotated link |Monetarism}}
* {{Annotated link |Thatcherism}}
* {{Annotated link |Trickle-down economics}}
* {{Annotated link |Reaganomics}}
{{div col end}}

== Notes and references ==
{{Reflist|colwidth=30em}}

== Further reading ==
* {{cite encyclopedia|last1=Gwartney|first1=James D.|editor=David R. Henderson|encyclopedia=Concise Encyclopedia of Economics|title=Supply-Side Economics|url=http://www.econlib.org/library/Enc/SupplySideEconomics.html|year=2008|edition=2nd|publisher=Library of Economics and Liberty|location=Indianapolis|isbn=978-0865976658|oclc=237794267}}
* {{cite journal |journal= Socio-Economic Review |volume=20 |issue=2 |date=April 2022 |pages =539–559 |title= The economic consequences of major tax cuts for the rich |doi=10.1093/ser/mwab061 |url=https://academic.oup.com/ser/article/20/2/539/6500315 |first1=David |last1=Hope |first2=Julian |last2=Limberg |doi-access=free }}
* {{Cite journal |last=Zidar |first=Owen |date=October 30, 2018 |title=Tax Cuts for Whom? Heterogeneous Effects of Income Tax Changes on Growth and Employment |journal=Journal of Political Economy |volume=127 |issue=3 |pages=1437–1472 |doi=10.1086/701424 |s2cid=158844554 |issn=0022-3808 |url=http://www.nber.org/papers/w21035.pdf |access-date=December 4, 2019 |archive-date=June 2, 2018 |archive-url=https://web.archive.org/web/20180602104923/http://www.nber.org/papers/w21035.pdf |url-status=live }} (working paper)

{{Economics}}
{{Macroeconomics}}

[[Category:Economic growth]]

{{Sourceattribution|Supply-side economics}}