View source for Social:Mixed electoral system

{{Short description|Family of voting systems}}
A '''mixed electoral system''' or '''mixed-member electoral system''' combines methods of [[Social:Majoritarian representation|majoritarian]] and [[Social:Proportional representation|proportional representation]] (PR).<ref name="IdeaElecSysDes">{{Cite web |year=2005 |title=Electoral System Design: The New International IDEA Handbook |url=https://www.idea.int/publications/catalogue/electoral-system-design-new-international-idea-handbook |publisher=[[Organization:International Institute for Democracy and Electoral Assistance|International Institute for Democracy and Electoral Assistance]]}}</ref><ref name="AceMixSys">{{Cite web |last=ACE Project Electoral Knowledge Network |title=Mixed Systems |url=https://aceproject.org/ace-en/topics/es/esd/esd03 |access-date=20 October 2017}}</ref><ref name="NorrisChoosingElecSys">{{Cite web |last=Norris |first=Pippa |year=1997 |title=Choosing Electoral Systems: Proportional, Majoritarian and Mixed Systems |url=http://www.hks.harvard.edu/fs/pnorris/Acrobat/Choosing%20Electoral%20Systems.pdf |publisher=[[Organization:Harvard University|Harvard University]]}}</ref> The majoritarian component is usually first-past-the-post voting (FPTP/SMP),<ref name="MassicotteSearch">{{Cite report |url=https://www.institutions-democratiques.gouv.qc.ca/publications/mode_scrutin_rapport_en.pdf |title=In Search of Compensatory Mixed Electoral System for Québec |last=Massicotte |first=Louis |date=2004}}</ref> whereas the proportional component is most often based on party-list PR. The results of the combination may be [[Social:Mixed-member proportional representation|mixed-member proportional]] (MMP), where the overall results of the elections are proportional,<ref name="AceMixSys" /> or [[Social:Mixed-member majoritarian representation|mixed-member majoritarian]], in which case the overall results are [[Social:Semi-proportional representation|semi-proportional]], retaining disproportionalities from the majoritarian component.

Mixed-member systems also often combine local representation<ref name="IfesElecSystems">{{Cite web|date=2 Jul 2009|title=Electoral Systems and the Delimitation of Constituencies|url=http://www.ifes.org/publications/electoral-systems-and-delimitation-constituencies|publisher=[[Organization:International Foundation for Electoral Systems|International Foundation for Electoral Systems]]}}</ref> (most often single-member constituencies) with regional or national (multi-member constituencies) representation, having multiple tiers.<ref name="BormannDemElecSys">{{Cite journal |last1=Bormann |first1=Nils-Christian |last2=Golder |first2=Matt |year=2013 |title=Democratic Electoral Systems around the world, 1946–2011 |url=http://mattgolder.com/files/research/es3.pdf |journal=Electoral Studies |volume=32 |issue=2 |pages=360–369|doi=10.1016/j.electstud.2013.01.005 |s2cid=154632837 }}</ref> This also means voters often elect different types of representatives who might have different types constituencies. Some representatives may be elected by personal elections where voters vote for [[Social:Candidate|candidate]]s, and some by list elections where voter vote primarily for [[Social:Electoral list|electoral list]]s of parties.

In most mixed systems, every voter can influence both the district-based and PR aspects of an election,<ref name=":1">{{Cite journal |last=Massicotte & Blais |date=1999 |title=Mixed electoral systems: a conceptual and empirical survey |journal=Electoral Studies|volume=18 |issue=3 |pages=341–366 |doi=10.1016/S0261-3794(98)00063-8 }}</ref> such as under [[Social:Parallel voting|parallel voting]]; in others, the voter casts just one vote ([[Social:Mixed single vote|mixed single vote]]), which is used to contribute to both a personal (usually district) election and to the filling of seats through list system.<ref name="BochslerTerritory">{{Cite book |last=Bochsler |first=Daniel |title=Territory and Electoral Rules in Post-Communist Democracies |date=May 13, 2010 |publisher=[[Company:Palgrave Macmillan|Palgrave Macmillan]] |isbn=9780230281424 |chapter=Chapter 5, How Party Systems Develop in Mixed Electoral Systems |chapter-url=https://books.google.com/books?id=qkCBDAAAQBAJ}}</ref> Most mixed systems have all the voters contributing to the election of both groups of members.

== Types of mixed systems ==

=== Compensatory/non-compensatory seat allocation ===
A major distinction is often made between mixed ''compensatory'' systems and mixed ''non-compensatory'' systems.<ref name="BochslerTerritory" /> In both types of systems, one set of seats is allocated using a plurality or majoritarian method, usually First past the post. The remaining seats are allocated to political parties partially or wholly based on a proportional allocation method such as highest averages or largest remainder. The difference is whether or not the results of the district elections are considered when allocating the PR seats.

In mixed non-compensatory systems, such as [[Social:Parallel voting|parallel voting]],<ref name=MassicotteSearch/> the proportional allocation is performed independently of the district election component.

In mixed compensatory systems, the allocation of the top-up seats is done in such a way as to compensate as much as possible for dis-proportionality produced by the district elections. MMP generally produces proportional election outcomes, meaning that a [[Social:Political party|political party]] that wins ''n'' percent of the vote will receive roughly ''n'' percent of the seats.

The following hypothetical example based on the one by Massicotte<ref name=MassicotteSearch/> illustrates how "top-up" PR seats are typically allocated in a compensatory system and in a non-compensatory system. The example assumes a 200-seat legislative assembly where 100 seats are filled using FPTP and the other 100 seats are awarded to parties using a form of PR. The table below gives the popular vote and FPTP results. The number of PR seats allocated to each party depends on whether the system is compensatory or non-compensatory.

{| class="wikitable"
|-
! colspan="2" |Party
! Popular vote
! FPTP seats
! PR seats
! Total seats (FPTP + PR)
!FPTP seats
|-
| style="background:#D10000" |
| Party A
| 44%
| 64
| ?
| ?
| rowspan="5" |[[File:Mixed compensatory example fptp.svg|frameless]]
|-
| style="background:#0008A5" |
| Party B
| 40%
| 33
| ?
| ?
|-
| style="background:#03AA00" |
| Party C
| 10%
| 0
| ?
| ?
|-
| style="background:#820084" |
| Party D
| 6%
| 3
| ?
| ?
|-
|
| TOTAL
| 100%
| 100
| 100
| 200
|}

In non compensatory system, each party wins its proportional share of the 100 PR seats. Under such a system, the total number of seats (FPTP + PR) received by each party would not be proportional to its share of the popular vote. Party A receives just slightly less of the popular vote than Party B, but receives significantly more seats. In addition to its success in the district contests, Party A receives almost as many of the PR seats as Party B.

{| class="wikitable"
|-
! colspan="2" |Party
! Popular vote
! FPTP seats
! PR seats (non-compensatory)
! Total seats (FPTP + PR)
!PR seats (non-compensatory)
!Total seats (FPTP + PR)
|-
| style="background:#D10000" |
| Party A
| 44%
| 64
| 44
| 108 (54% of assembly)
| rowspan="5" |[[File:Mixed compensatory example non compensatory parallel seats.svg|frameless]]
| rowspan="5" |[[File:Mixed compensatory example non compensatory total seats.svg|frameless]]
|-
| style="background:#0008A5" |
| Party B
| 40%
| 33
| 40
| 73 (36.5% of assembly)
|-
| style="background:#03AA00" |
| Party C
| 10%
| 0
| 10
| 10 (5% of assembly)
|-
| style="background:#820084" |
| Party D
| 6%
| 3
| 6
| 9 (4.5% of assembly)
|-
|
| TOTAL
| 100%
| 100
| 100
| 200
|}

If the PR seats are allocated in a compensatory system, the total number of seats awarded to each party is proportional to the party's share of the popular vote. Party B wins 33 of the district seats and its proportional share of the 200 seats being filled is 80 seats (40 percent of the total 200 seats) (the same as its share of the popular vote) so it is awarded 47 of the PR seats.

{| class="wikitable"
|-
! colspan="2" |Party
! Popular vote
! FPTP seats
! PR seats (compensatory)
! Total seats (FPTP + PR)
!PR seats (compensatory)
!Total seats (FPTP + PR)
|-
| style="background:#D10000" |
| Party A
| 44%
| 64
| 24
| 88 (44% of assembly)
| rowspan="5" |[[File:Mixed-compensatory-example compensatory seats.svg|center|frameless]]
| rowspan="5" |[[File:Mixed-compensatory-example total seats.svg|frameless]]
|-
| style="background:#0008A5" |
| Party B
| 40%
| 33
| 47
| 80 (40% of assembly)
|-
| style="background:#03AA00" |
| Party C
| 10%
| 0
| 20
| 20 (10% of assembly)
|-
| style="background:#820084" |
| Party D
| 6%
| 3
| 9
| 12 (6% of assembly)
|-
|
| TOTAL
| 100%
| 100
| 100
| 200
|}

In practice, compensatory seat allocation is complicated by the possibility that one or more parties wins so many of the district seats ("overhang") that the available number of PR seats is insufficient to produce a fully proportional outcome.<ref name="BochslerQuasi">{{Cite journal |last=Bochsler |first=Daniel |year=2012 |title=A quasi-proportional electoral system 'only for honest men'? The hidden potential for manipulating mixed compensatory electoral systems |url=http://www.bochsler.eu/publi/bochsler_albania-ipsr2011.pdf |journal=International Political Science Review |volume=33 |issue=4 |pages=401–420|doi=10.1177/0192512111420770 |s2cid=154545923 }}</ref> Some mixed compensatory systems have rules that address these situations by adding additional PR seats to achieve overall PR. These seats are used only until the next election, unless needed again at that time.<ref name=MassicotteSearch/>

The two common ways compensation occurs are ''seat linkage'' compensation (or top-up) and ''vote linkage'' compensation (or vote transfer).<ref name="BochslerQuasi" /> Like a non-compensatory mixed system, a compensatory mixed system may be based on the [[Social:Mixed single vote|mixed single vote]] (voters vote for a local candidate and that vote is used to set the party share of the popular vote for the party that the candidate belongs to) or it may be based on voters casting two separate votes.<ref name=":0" />
{| class="wikitable"
! colspan="3" |Compensatory mixed systems
|-
!
! single vote systems
! dual vote systems
|-
! rowspan="4" | Seat linkage
| rowspan="4" | [[Social:Mixed single vote#Proportional systems|mixed single vote, top-up versions]] (MSV)

* single vote MMP
* single vote AMS (Bolivia, Lesotho)
| [[Social:Mixed-member proportional representation|mixed-member proportional representation]] (MMP)
|-
|[[Social:Additional member system|additional member system]] (AMS)
|-
|[[Social:Alternative vote plus|alternative vote plus]] (AV+)
|-
|Hybrids: e.g. parallel voting+AMS (South Korea)
|-
! rowspan="3" | Vote linkage
| [[Social:Mixed single vote|positive vote transfer]]  (PVT/MSV)

* Hungarian PVT/MSV (local elections)
* Romanian PVT/MSV system (2008-2012)
| Hybrids:

* Parallel voting+PVT (Hungary)
* negative vote transfer/scorporo (Italy, 1993–2005)
|-
| colspan="2" |Others systems:
|-
|dual-member proportional (DMP)
|[[Social:Mixed ballot transferable vote|mixed ballot transferable vote]] (MBTV)
|-
! colspan="3" |Non-compensatory mixed systems
|-
!
!single vote systems
!dual vote systems
|-
!No linkage
!-
|[[Social:Parallel voting|parallel voting]]
|-
!Vote linkage
|mixed single vote, ''superposition''
* Italian variant (Rosatellum)
!-
|-
!Seat linkage
|List seats proportional to FPTP seats

* Pakistan
!-
|}

=== Types of combinations ===
Apart from the compensatory/non-compensatory typology, a more detailed classification is possible based on how component systems relate to each other, according to academic literature. Below is a table of different categories of mixed electoral systems based on the five main types identified by Massicotte & Blais.<ref name=":1" /> According to their terminology, methods of compensation are referred to as ''compensation'' is referred to as ''correction,'' while another type of dependent combination exists, called the ''conditional'' relation between sub-systems. Meanwhile, independent combinations mixed systems might have both local and national/regional tiers (called ''superposition''), but some have only one at-large (national) tier, like the [[Social:Majority bonus system|majority bonus system]] (''fusion'') or only a single tier for local/regional representation (called ''coexistence'').

There are also ''supermixed systems'', like rural-urban proportional (RUP), which is a hybrid mixed system that uses two tiers: the lower tier uses a proportional system, like list-PR or [[Social:Single transferable vote|STV]], in urban regions, and the upper tier uses MMP (itself a mixed system) either in rural regions alone or in all regions.<ref name="MassicotteSearch" /> Another supermixed system is scorporo, which is a hybrid of [[Social:Parallel voting|parallel voting]] and the [[Social:Mixed single vote|mixed single vote]]).<ref name=":1"/>

{| class="wikitable"
|+
!Combination
!Type
!Attributes
!System
!Example(s) for use
|-
| rowspan="4" |Independent combination
|''Fusion''
|Two formulas are used within each district (or one district for the whole electorate)
|[[Social:Majority bonus system|Majority bonus]] (MBS)
|
|-
|''Coexistence (hybrid)''
|Different districts use different systems in one tier
|e.g. FPTP/SMP in single-member districts, list-PR in multi-member districts 
|Democratic Republic of the Congo, Panama
|-
| rowspan="2" |''Superposition''
| rowspan="2" |Different tiers use different systems
|[[Social:Parallel voting|Parallel voting]] (e.g. FPTP/SMP locally, list-PR nationally)
|Lithuania, Russia
|-
|Single vote mixed-member majoritarian (e.g. FPTP/SMP locally, list-PR nationally)
|Italy, Pakistan
|-
| rowspan="5" |Dependent combination
| rowspan="4" |''Correction (compensation)''
| rowspan="4" |One formula uses the results of other to compensate
|[[Social:Mixed-member proportional representation|Mixed-member proportional representation]] (MMP)
|Germany, New Zealand
|-
|[[Social:Additional member system|Additional member system]] (AMS) - the semi-proportional version of MMP
|Scotland, Wales
|-
|Compensatory versions of [[Social:Mixed single vote|mixed single vote]], like positive vote transfer systems (PVT) or single vote MMP
|Lesotho, Bolivia
|-
|Majority jackpot system
|Armenia, San Marino
|-
|''Conditional''
|Outcome of one formula determines the other formula
|e.g. conditional party block voting: party that receives more than 50%, gets all seats otherwise winner gets 50% of seats and rest is distributed proportionally
|
|-
| rowspan="5" |Combination of combinations
| rowspan="5" |''Supermixed''
|''Superposition + correction''
|Scorporo / negative vote transfer (NVT), Parallel voting + PVT, Parallel voting + AMS
|Hungary, South Korea
|-
|''Superposition + Fusion''
|[[Social:Majority bonus system|Majority bonus]] (MBS)
|Greece (formerly)
|-
|''Coexistence + conditional''
|e.g. FPTP/SMP in single-member districts, conditional party block voting in multi-member districts
|Cameroon, Chad
|-
|''Coexistence + correction''
|Rural-urban proportional representation (RUP)
|Denmark (formerly), Iceland (formerly)
|-
|''Fusion + correction''
|Dual-member proportional representation (DMP)
| -
|}
In a ''hybrid system'', different electoral formulas are used in different contexts. These may be seen in ''coexistence'', when different methods are used in different regions of a country, such as when FPTP is used in single-member districts and list-PR in multi-member districts, but every voter is a member of only one district (one tier). Some hybrid systems are generally not referred to as mixed systems, such as when as FPTP districts are the exception (e.g. overseas constituency) and list-PR is the rule, the overall system is usually considered proportional. Similarly, when FPTP is in single-member districts and used block voting (or party block voting) is used in multi-member districts, the system is referred to as a majoritarian one, as all components are majoritarian. Most mixed systems are not referred to as hybrid systems

=== Mixed-member majoritarian and mixed-member proportional ===
{{Main|Social:Mixed-member majoritarian representation|Social:Mixed-member proportional representation}}
Another distinction of mixed electoral systems is between [[Social:Mixed-member proportional representation|mixed-member proportional representation]] (MMP) and [[Social:Mixed-member majoritarian representation|mixed-member majoritarian representation]] (MMM).

==== Parallel voting ====
{{Main|Social:Parallel voting}}
Parallel voting is a mixed non-compensatory system with two tiers of representatives: a tier of single-member district representatives elected by a plurality/majoritarian method such as FPTP/SMP, and a tier of regional or at-large representatives elected by a separate proportional method such as party list PR. It is used for the first chamber (lower house) in many countries including Japan and Russia.

This type of parallel voting provides [[Social:Semi-proportional representation|semi-proportional]] results, but is often referred to as [[Social:Mixed-member majoritarian representation|mixed-member majoritarian representation]], as the lack of compensation means each party can keep all the overhang seats it might win on the majoritarian side of the electoral system.

==== Additional member systems (AMS) ====
{{Main|Social:Additional member system}}

Like parallel voting, MMP and AMS also have a tier of district representatives typically elected by FPTP, and a tier of regional or at-large representatives elected by PR. Unlike parallel voting, MMP and AMS are mixed compensatory systems, meaning that the PR seats are allocated in a manner that corrects disproportionality caused by the district tier. MMP corrects disproportionalities by adding as many leveling seats as needed, this system is used by Germany and New Zealand.

The type of MMP which does not always yield proportional results, but sometimes only "mixed [[Social:Semi-proportional representation|semi-proportional]] representation" is called an [[Social:Additional member system|additional member system]]. If the fixed number of compensatory seats are enough to compensate the results of the majoritarian FPTP/SMP side of the election, AMS is equivalent to MMP, but if not, AMS does not compensate for remaining overhang seats. In Bolivia and Lesotho, where single vote versions of AMS are used with a relatively large number of compensatory seats, results are usually proportional. AMS models used in parts of the {{wipe|United Kingdom}} (Scotland and Wales), with small regions with a fixed number of seats tend to produce only moderately proportional election outcomes.

==== Majority bonus and majority jackpot systems ====
{{Main|Social:Majority bonus system}}

Electoral systems with a majority bonus have been referred to as "unconventional mixed systems".<ref name="BedockElecSysWithMajBonus">{{Cite journal |last1=Bedock |first1=Camille |last2=Sauger |first2=Nicolas |year=2014 |title=Electoral Systems with a Majority Bonus as Unconventional Mixed Systems |journal=Representation |volume=50 |issue=1 |pages=99–12 |doi=10.1080/00344893.2014.902220|s2cid=154685383 }}</ref> Employed by [[Place:Armenia|Armenia]], Greece, and San Marino, as well as Italy from 2006 to 2013,<ref>{{Cite news |last=Marco Bertacche |date=March 2, 2018 |title=How Italy's New Electoral System Works |work=Bloomberg Politics |url=https://www.bloomberg.com/news/articles/2018-03-02/italy-is-rolling-out-a-new-electoral-system-here-s-how-it-works}}</ref> majority bonuses help the most popular party or alliance win a majority of the seats with a minority of the votes, similar in principle to plurality/majoritarian systems. However, PR is used to distribute seats among the opposition parties, and possibly within the governing alliance.

==== Scorporo and negative vote transfer (NVT) ====

Scorporo is a two-tier mixed system similar to MMP in that voters have two votes (one for a local candidate on the lower tier, and one for a party list on the upper tier), except that disproportionality caused by the single-member district tier is partially addressed through a vote transfer mechanism.<ref name="BochslerWhichMmp">{{Cite journal |last1=Bochsler |first1=Daniel |last2=Golder |first2=Matt |year=2014 |title=Which mixed-member proportional electoral formula fits you best? Assessing the proportionality principle of positive vote transfer systems |url=http://www.bochsler.eu/publi/bochsler_representation14.pdf |journal=Representation |volume=50 |issue=1 |pages=113–127 |doi=10.1080/00344893.2014.902222 |s2cid=153691414}}</ref> Votes that are crucial to the election of district-winning candidates are excluded from the PR seat allocation, for this reason the method used by scorporo is referred to as a negative vote transfer system.<ref>{{Cite journal |last=Ferrara |first=F |date=2003 |title=Electoral coordination and the strategic desertion of strong parties in compensatory mixed systems with negative vote transfers |journal=Electoral Studies}}</ref> The system was used in Italy from 1993 to 2005, and a modified version is currently used in Hungary.<ref name="LeBretonProbCastDecVote">{{Cite web |last1=Le Breton |first1=Michel |last2=Lepelley |first2=Dominique |last3=Merlin |first3=Vincent |year=2015 |title=The probability of casting a decisive vote in a mixed-member electoral system using plurality at large |url=http://cemoi.univ-reunion.fr/fileadmin/Fichiers/CEMOI/Publications/Documents_de_travail/2016/The_probability_of_casting....pdf}}</ref>

==== Mixed ballot transferable vote (MBTV) ====
{{Main|Social:Mixed ballot transferable vote}}

MBTV is a mixed compensatory type of systems similar to MSV, except voters can vote separately for a local candidate and as a transfer vote on the compensatory tier.<ref>{{Cite web |title=Electoral incentives and the equal value of ballots in vote transfer systems with positive winner compensation |url=https://www.researchgate.net/publication/354074473 }}</ref> It is different from MMP/AMS and AV+ in that there is a vote linkage (instead of seat linkage) between the tiers. The two parts of the dual ballot are tied in a way that only those lists votes get counted, which are on ballots that would be transfer votes in an equivalent positive vote transfer MSV system.

==== Alternative vote plus (AV+) ====
{{Main|Social:Alternative vote plus}}

AV+ is a mixed compensatory system similar to the [[Social:Additional member system|additional member system]], with the notable difference that the district seats are awarded using the alternative vote. The system was proposed by the Jenkins Commission as a possible alternative to FPTP for elections to the Parliament of the United Kingdom.

==== Dual member proportional (DMP) ====

DMP is a mixed compensatory system similar to MMP, except that the plurality and PR seats are paired and dedicated to dual-member (two seat) districts. Proposed as an alternative to FPTP for Canadian elections, DMP appeared as an option on a 2016 plebiscite in Prince Edward Island and a 2018 referendum in British Columbia.

=== Number of votes ===

==== Double vote ====
Most mixed systems allow voters to cast separate votes for different formulas of the electoral system, including:

* Parallel voting
* Most AMS/MMP systems
* AV+ (the first vote is [[Social:Ranked voting|ranked]])
* Scorporo

==== Mixed single vote (MSV) ====
{{Main|Social:Mixed single vote}}

MSV is a type of mixed systems using only a single vote that serves both as a vote for a local candidate and as a party list vote, split ticket voting is not possible. The system was used in Germany in a mixed proportional system,<ref name=":0">{{Cite journal|last=Golosov|first=G. V.|date=2013|title=The Case for Mixed Single Vote Electoral Systems|journal=The Journal of Social, Political, and Economic Studies}}</ref> and is currently used in Hungary as a semi-proportional system as well as Italy in a non-compensatory system. Other mixed systems using a single vote include majority bonus/jackpot systems and DMP.

Other systems that are usually considered mixed, which use a single vote are:

* Majority bonus and jackpot (a single party-list vote)
* DMP (a vote for a single candidate or a two-candidate ticket)

The RUP systems formerly used in Denmark and Iceland used a single vote, applicable both for the lower-tier constituencies - FPTP in the rural single-member constituencies, and list PR in the urban multi-member constituencies - and for the upper-tier national leveling seats (and in Denmark, also for the middle-tier regional leveling seats in rural areas). The implementation of RUP proposed in Canada foresees urban multi-member districts that use a [[Social:Single transferable vote|single transferable vote]], alongside single-member rural districts that are grouped in large multi-member regions; the rural districts and their corresponding regions.

==== Double simultaneous vote (DSV) ====
{{Main|Social:Double simultaneous vote}}

A simultaneous vote is a single vote that used in more than one elections held at once, which means it is not a typically regarded as a mixed system.{{Citation needed|date=April 2022}}

==List of countries using mixed systems==

The table below lists the countries that use a mixed electoral system for the first chamber of the legislature. Countries with ''coexistence''-based hybrid systems have been excluded from the table, as have countries that mix two plurality/majoritarian systems. (See also the complete list of electoral systems by country.)

{| class="wikitable"
|-
! Country
!Body
!Latest election
(year)
! Type of mixed system
!Seats per constituency
!Mixed system
!Component electoral systems
!Total seats
!Number of votes
!Typical results
!Notes
|-
| '''{{Flagicon|Andorra}} Andorra'''
|General Council
|2023
| Non-compensatory
|2 (local districts), 14 (nationwide constituency)
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|Party block voting (PBV) and party-list PR
|28
|2
|semi-proportional
|The parish lists and the national list are independent of one another: the same person cannot appear on both the national list and on a parish list, and voters cast two separate ballots (there is no requirement to vote for the same party for both lists).<ref>Arts. 19, 51 & 52, Law 28/2007.</ref>
|-
| rowspan="4" |'''{{Flagicon|Argentina}} Argentina'''
|'''{{Flagicon|Córdoba}}''' Legislature of Córdoba Province
|2019
|Non-compensatory
|1 (local districts), 44 (nationwide constituency)
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|
|70
|2
|semi-proportional
|
|-
|'''{{Flagicon|Río Negro Province}}''' Legislature of Río Negro Province
|
|Non-compensatory
|
|
|
|
|
|
|
|-
|'''{{Flagicon|San Juan}}''' Legislature of San Juan Province
|
|Non-compensatory
|
|
|
|
|
|
|
|-
|'''{{Flagicon|Santa Cruz}}''' Legislature of Santa Cruz Province
|
|Non-compensatory
|
|
|
|
|
|
|
|-
| '''{{Flagicon|Armenia}} Armenia'''
|
|
| Partially compensatory
|
|Majority jackpot system
|Party-list PR + party block voting (PBV)
|
|
|
|
|-
| '''{{Flagicon|Bolivia}}''' '''Bolivia'''
|Chamber of Deputies
|2020
| Compensatory
|1 (local districts), ? (regional constituencies), 7 (indigenous seats elected by the ''usos y costumbres'')
|[[Social:Additional member system|Additional member system]] (AMS) - MMP without levelling seats
|First-past-the-post (FPTP/SMP) + Party-list PR
|
|1 ([[Social:Mixed single vote|mixed single vote]])
|proportional
|Ballots use a [[Social:Double simultaneous vote|double simultaneous vote]] with the presidential election{{sfnm|1a1=Mayorga|1y=1997|2a1=Mayorga|2y=2001|2p=194}}
|-
|'''{{Flagicon|Djibouti}} Djibouti'''
|National Assembly
|2018
|
|3-28
|
|
|65
|
|
|80% of seats (rounded to the nearest integer) in each constituency are awarded to the party receiving the most votes (party block voting), remaining seats are allocated proportionally to other parties receiving over 10% (closed list, D'Hondt method)
|-
| '''{{Flagicon|Georgia}} Georgia'''
|Parliament
|2020
| Non-compensatory
|
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|
|150
|
|semi-proportional
|
|-
| rowspan="2" | '''{{Flagicon|Germany}}''' '''Germany'''
|Bundestag (lower house of the federal parliament)
|2021
| Compensatory
|1 (local districts), ''varies'' (regional constituencies),
|[[Social:Mixed-member proportional representation|Mixed-member proportional representation]] (MMP) - with levelling seats
|Party-list PR + First-past-the-post (FPTP/SMP)
|598 + leveling seats
|2
|proportional
|Referred to as personalized proportional representation,<ref>{{cite web|title=The Voting System|url=https://www.bmi.bund.de/EN/topics/constitution/electoral-law/voting-system/voting-system-node.html|website=BMI|publisher=Federal Ministry of the Interior, Building & Community}}</ref> in 1949 as a result of inter-party bargaining.<ref>{{cite web|last1=Krennerich|first1=Michael|title=Germany: The Original Mixed Member Proportional System|url=https://aceproject.org/regions-en/countries-and-territories/DE/case-studies/germany-the-original-mixed-member-proportional-system|website=ACE Project|publisher=The Electoral Knowledge Network}}</ref> Originally used single vote version, switched to two vote version before the 1953 election.
|-
|State parliaments, except

* '''{{Flagicon|Bremen}}''' Bremen,
* '''{{Flagicon|Hamburg}}''' [[Place:Hamburg|Hamburg]]
* '''{{Flagicon|Saarland}}''' Saarland
|''varies by state''
|Compensatory
|''varies by state''
|[[Social:Mixed-member proportional representation|Mixed-member proportional representation]] (MMP) - with levelling seats
|Party-list PR + First-past-the-post (FPTP/SMP)
|''varies by state''
|''varies by state''
|
|Bavaria uniquely uses an open-list system for its party-list seats. Baden-Württemberg uses [[Social:Zweitmandat|MMP without lists]].
|-
| '''{{Flagicon|Greece}}''' '''Greece'''
|Hellenic Parliament
|2019
| Non-compensatory
|
|[[Social:Majority bonus system|Majority bonus]]
|
|
|
|semi-proportional
|
|-
| '''{{Flagicon|Guinea}} Guinea'''
|National Assembly
|2020
| Non-compensatory
|1 (local districts), 76 (national constituency)
|[[Social:Parallel voting|parallel voting]]  (''superposition)''
|Party-list PR (Hare quota) + First-past-the-post (FPTP/SMP)
|114
|
|semi-proportional
|
|-
| '''{{Flagicon|Hungary}} Hungary'''
|National Assembly (Országgyűlés)
|2018
| Partially compensatory
|1 (local districts), 93 (national constituency)
|''Supermixed:'' [[Social:Parallel voting|parallel voting]] (''superposition'') and [[Social:Mixed single vote|positive vote transfer]] (''correction'')
|First-past-the-post (FPTP/SMP) + national list-PR
|199
|2
|semi-proportional
|
|-
| rowspan="2" | '''{{Flagicon|Italy}} Italy'''
|Chamber of Deputies
|2022 
| Non-compensatory
|1 (147 single-member districts) 
245 (national constituency, seats redistributed into 49 multi-member districts)

8 (Italians abroad constituency)<ref name="deputati">{{Cite web |last=deputati |first=Camera dei |date=2022-02-25 |title=Sistema elettorale e geografia dei collegi - Costituzione, diritti e libertà |url=https://temi.camera.it/leg18/temi/tl18_riforma_elettorale.html |access-date=2023-03-28 |website=Documentazione parlamentare |language=IT}}</ref>
|''Superposition''
|List PR + First-past-the-post (FPTP/SMP)
|400
|1 ([[Social:Mixed single vote|mixed single vote]])
|semi-proportional
|mixed single vote
|-
|Senate
|2022
|Non-compensatory
|1 (74 single-member districts)
''varies, cannot be less than 2'' (20 regional constituencies, seats redistributed into 26 multi-member districts)

4 (Italians abroad constituency)
<ref name="deputati"/>
|''Superposition''
|List PR + First-past-the-post (FPTP/SMP)
|200
|1 ([[Social:Mixed single vote|mixed single vote]])
|semi-proportional
|mixed single vote
|-
| rowspan="2" |'''{{Flagicon|Japan}} Japan'''
|House of Representatives
|
|Non-compensatory
|
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|First-past-the-post (FPTP/SMP) and List PR
|289
|2
|
|
|-
|House of Councillors
|
|Non-compensatory
|
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|SNTV and List PR
|
|2
|
|
|-
|'''{{Flagicon|South Korea}} Republic of Korea (South Korea)'''
|National Assembly
|2020
|Partially compensatory
|1 (local districts), 17 supplementary seats (parallel voting), 30 additional seats (AMS),
|''Supermixed'' [[Social:Parallel voting|parallel voting]] (''superposition'') and [[Social:Mixed single vote|additional member system]] (''correction'')
|Party-list PR + First-past-the-post (FPTP/SMP)
|
|2
|semi-proportional
|
|-
|'''{{Flagicon|Kyrgyzstan}} Kyrgyzstan'''
|Supreme Council
|2021
|Non-compensatory
|1 (local districts), 54 (nationwide constituency)
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|Party-list PR + First-past-the-post (FPTP/SMP)
|
|2
|semi-proportional
|
|-
| '''{{Flagicon|Lesotho}} Lesotho'''
|
|
| Compensatory
|
|[[Social:Additional member system|Additional member system]] (AMS)
|
|
|1 ([[Social:Mixed single vote|mixed single vote]])
|proportional
|
|-
| '''{{Flagicon|Lithuania}} Lithuania'''
|Seimas
|
| Non-compensatory
|
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|TRS and List PR
|71
|
|semi-proportional
|
|-
| '''Mauritania'''
|
|
|
|
|
|
|
|
|
|
|-
| rowspan="2" | '''{{Flagicon|Mexico}} Mexico'''
|Chamber of Deputies
|2021
| Partially compensatory
|1 (local districts), 40 (multi-member districts)
|''Supermixed'' [[Social:Parallel voting|parallel voting]] (''superposition'') and [[Social:Mixed single vote|additional member system]] (''correction'')
|First-past-the-post (FPTP/SMP) + Party-list PR (Largest remainder:Hare quota)
|
|2
|semi-proportional
| rowspan="2" |Since 1996, a party cannot get more seats overall than 8% above its result nationally (i.e., to win 50% of the legislative seats, a party must win at least 42% of the vote nationwide). There are three exceptions on this rule: first, a party can only lose PR-seats due to this rule (and no plurality-seats); second, a party can never get more than 300 seats overall (even if it has more than 52% of the vote nationally); and third, a party can exceed this 8% rule if it wins the seats in the single-member districts.
|-
|Chamber of Senators
|2018
|Non-compensatory
|3 (local districts), 32 (multi-member districts)
|''Superposition''
|Limited (party) block voting locally (2 seats from each constituency to largest party, 1 to the second largest party) + Party-list PR nationwide
|
|1 ([[Social:Mixed single vote|mixed single vote]])
|semi-proportional
|-
| '''Monaco'''
|
|
|
|
|
|
|
|
|
|
|-
| '''Mongolia'''
|
|
|
|
|
|
|
|
|
|
|-
| '''Morocco'''
|
|
|
|
|
|
|
|
|
|
|-
| '''Nepal'''
|
|
|
|
|
|
|
|
|
|
|-
| '''{{Flagicon|New Zealand}} New Zealand'''
|House of Representatives
|
| Compensatory
|
|[[Social:Mixed-member proportional representation|mixed member proportional]] (MMP)
|
|
|2
|
|
|-
|'''Pakistan'''
|National Assembly
|
|Non-compensatory
|
|''Superposition,''seat linkage non compensatory
|First-past-the-post (FPTP/SMP) for 272 seats + 70 members appointed by parties proportional with seats already won
|
|1
|
|
|-
| {{Flagicon|Philippines}} '''Philippines'''
|House of Representatives
|2019
| Non-compensatory
|
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|
|
|
|
|
|-
| '''{{Flagicon|Russian Federation}} Russian Federation'''
|State Duma
|2021
| Non-compensatory
|
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|
|
|
|
|
|-
| '''{{Flagicon|San Marino}} San Marino'''
|Grand and General Council
|2019
| Non-compensatory
|
|[[Social:Majority bonus system|Majority bonus]]
|
|
|
|semi-proportional
|
|-
| '''{{Flagicon|Senegal}} Senegal'''
|National Assembly
|2017
| Non-compensatory
|
|
|
|
|
|
|
|-
| '''{{Flagicon|Seychelles}} Seychelles'''
|National Assembly
|2020
| Non-compensatory
|
|
|
|
|
|
|
|-
| '''{{Flagicon|South Africa}} South Africa'''
|Municipal elections including:
* Local municipalities
* Metropolitan municipalities
|2021
| Compensatory
|1
|[[Social:Mixed-member proportional representation|MMP]] with ca. 50% FPTP and 50% AMS
|Varies by municipality 
7 - 270
|
|
|
|Two ballots - one with FPTP candidates (Ward) and the other with just party names (PR). Compensatory seats are based on the sum of both ballots, effectively allocated using the D'Hondt method.
|-
| '''Sri Lanka'''
|
|
|
|
|
|
|
|
|
|
|-
| '''{{Flagicon|Taiwan}} Taiwan(Republic of China)'''
|Legislative Yuan
|2020
| Non-compensatory
|
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|
|
|
|
|
|-
| '''{{Flagicon|Tajikistan}} Tajikistan'''
|Assembly of Representatives
|2020
| Non-compensatory
|
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|
|
|
|
|
|-
| '''{{Flagicon|Tanzania}} Tanzania'''
|National Assembly
|2020
| Non-compensatory
|
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|
|
|
|
|
|-
| '''{{Flagicon|Thailand}} Thailand'''
|House of Representatives
|next election,
''last election (2019)  was held under  [[Social:Mixed-member proportional representation|MMP]]''
| Non-compensatory
|
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|
|
|2
|
|
|-
| rowspan="3" |'''{{Flagicon|United Kingdom}}''' '''United Kingdom'''
|'''{{Flagicon|Scotland}}''' '''Scotland''' - Scottish Parliament
|
|Compensatory
|
|[[Social:Additional member system|Additional member system]] (AMS)
|
|
|semi-proportional
|
|
|-
|'''{{Flagicon|Wales}}''' '''Wales''' - Senedd (Welsh Parliament)
|
|Compensatory
|
|[[Social:Additional member system|Additional member system]] (AMS)
|
|2
|semi-proportional
|
|
|-
|Local elections in

* '''{{Flagicon|London}}''' [[Place:London|London]] (Assembly)
|
|Compensatory
|
|[[Social:Additional member system|Additional member system]] (AMS)
|
|
|
|
|
|-
| '''{{Flagicon|Venezuela}} Venezuela'''
|National Assembly
|2020
| Non-compensatory
|1 (local districts), 400 (nationwide constituency)
|[[Social:Parallel voting|Parallel voting]]  (''superposition)''
|
|
|2
|
|
|-
| '''{{Flagicon|Zimbabwe}} Zimbabwe'''
|National Assembly
|2018
| Non-compensatory
|1 (local districts),
10 (proportional constituencies)
|''Superposition''
|
|
|1
|
|
|}

==See also==
* Electoral systems
* List of electoral systems by country
* [[Social:Proportional representation|Proportional representation]]
* [[Social:Semi-proportional representation|Semi-proportional representation]]
* [[Social:Representative democracy|Representative democracy]]
* [[Social:Types of democracy|Types of democracy]]

==References==
{{reflist}}

==External links==
* [http://aceproject.org/epic-en/CDMap?question=ES005&set_language=en Chamber 1 Electoral Systems Map] from the [https://aceproject.org/ ACE Electoral Knowledge Network]


[[Category:Electoral systems]]

{{Sourceattribution|Mixed electoral system}}