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| Voting systems | |
|---|---|
| Name | Voting systems |
| Type | Political procedure |
| Region | Worldwide |
| Introduced | Ancient to modern |
| Related | Electoral law, Ballot design, Proportional representation |
Voting systems are structured methods for aggregating individual preferences into a collective decision used in elections and assemblies. They provide rules for ballots, counting, and seat allocation, balancing representation, stability, and fairness across contexts like national elections, municipal councils, and corporate boards. Major debates involve normative criteria, strategic behavior, administrative feasibility, and historical development linked to institutions and reform movements.
Voting systems determine how votes cast by citizens or members translate into winners and policies in bodies such as United Nations General Assembly, European Parliament, United Kingdom House of Commons, United States House of Representatives, and Constitutional Court of South Africa. Designs reflect choices among plurality rules used in United States presidential elections, majoritarian methods seen in French presidential election, and proportional methods used in German federal election and Swedish Riksdag. Key stakeholders include political parties like Conservative Party (UK), Democratic Party (United States), Christian Democratic Union of Germany, institutions such as International Foundation for Electoral Systems, and reform advocates exemplified by Electoral Reform Society.
Common categories include plurality/majoritarian systems like first-past-the-post employed in Canadian federal election and two-round systems used in French presidential election; proportional representation variants such as party-list PR in Netherlands general election and mixed-member proportional in German federal election; single-winner preferential systems including instant-runoff voting used in Australian House of Representatives and Condorcet methods considered in deliberations by British Columbia Citizens' Assembly on Electoral Reform; and scoring rules like approval voting advocated by groups such as FairVote and explored in Mayor of Fargo experiments. Other mechanisms include single transferable vote implemented in Republic of Ireland general election and cumulative voting used historically in Illinois general assembly elections.
Social choice theory frames evaluation via criteria named after scholars and cases: the Condorcet winner condition associated with Marie Jean Antoine Nicolas de Caritat, Marquis de Condorcet debates, the monotonicity criterion examined in Kenneth Arrow's impossibility theorem, and the participation criterion discussed by Amartya Sen. Arrow's theorem contrasts with Gibbard–Satterthwaite results by Allan Gibbard and Mark Satterthwaite showing manipulability in deterministic systems with three or more alternatives; the later Duggan–Schwartz theorem refines strategy-proofness considerations applied in contexts like European Court of Human Rights deliberations. Paradoxes include Condorcet cycles documented in analyses of the 1968 Democratic National Convention realignments and the spoiler effect highlighted in 2000 United States presidential election studies.
Strategic behavior appears in plurality contests such as tactical voting in United Kingdom general election, 1997 analyses, vote-splitting incidents in 2000 United States presidential election, and insincere ranking in instant-runoff debates after Australian Electoral Commission reports. Game-theoretic models built by scholars linked to John Nash and institutions like Princeton University explore equilibria where parties from coalitions such as European People's Party adjust platforms. Empirical work on strategic voting uses data from referendums like Brexit referendum and municipal recalls in Oakland, California to study incentives under approval voting debates promoted by The Center for Election Science.
Administration concerns cover ballot design challenges observed in the 2000 United States presidential election butterfly ballot, voter registration systems used by Electoral Commission (UK), absentee and mail voting as practiced in Switzerland, and electronic voting trials by vendors contracted by State of Indiana. Standards and oversight are set by international observers from Organization for Security and Co-operation in Europe and technical guidelines from National Institute of Standards and Technology. Logistical issues include districting and redistricting controversies overseen by bodies like the California Citizens Redistricting Commission and legal adjudication in courts such as the Supreme Court of the United States.
System choice affects party systems exemplified by Duverger's law debates involving Maurice Duverger, coalition formation in countries like Netherlands general election, legislative cohesion in Japanese House of Representatives history, and representation of minority groups as litigated in Voting Rights Act of 1965 cases before the United States Supreme Court. Electoral systems influence policy by shaping incentives faced by incumbents from parties like Social Democratic Party of Germany and movements such as Tea Party movement. Comparative studies by organizations including International Institute for Democracy and Electoral Assistance link systems to turnout patterns seen in Belgian general election compulsory voting and campaign finance effects ruled on in Citizens United v. Federal Election Commission.
The evolution spans ancient assemblies like the Roman Republic comitia, medieval innovations in Magna Carta era practices, the adoption of secret ballot reforms such as the Australian ballot movement, and modern codifications in documents like the United States Constitution and European Convention on Human Rights. Reform episodes include the expansion of suffrage following Representation of the People Act 1918, proportionalization waves after World War I in Scandinavia, and late-20th-century experiments in New Zealand general election, 1996 shifting to mixed-member proportional systems following the Royal Commission on the Electoral System (New Zealand). Ongoing debates engage actors from Harvard University scholars to national commissions like the British Columbia Citizens' Assembly on Electoral Reform.
Category:Elections