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Electoral system
Method by which voters make a choice between options / From Wikipedia, the free encyclopedia
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An electoral or voting system is a set of rules that determine how elections and referendums are conducted and how their results are determined. Electoral systems are used in politics to elect governments, while non-political elections may take place in business, non-profit organisations and informal organisations. These rules govern all aspects of the voting process: when elections occur, who is allowed to vote, who can stand as a candidate, how ballots are marked and cast, how the ballots are counted, how votes translate into the election outcome, limits on campaign spending, and other factors that can affect the result. Political electoral systems are defined by constitutions and electoral laws, are typically conducted by election commissions, and can use multiple types of elections for different offices.
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Winner-take-all system, single-winner districts
Winner-take-all system, multi-winner districts
Semi-proportional system
Proportional system
Party-list proportional representation (Closed list)
Party-list proportional representation (Open list)
Panachage (Open list)
Party-list proportional representation (Partially-open list)
Single transferable vote
Mixed system
Mixed-member proportional representation (MMP)
Personalised proportional representation (German implementation of MMP)
Additional member system (Semi-proportional MMP)
Parallel voting (MMM) (Party-list PR and FPTP)
Parallel voting (MMM) (Party-list PR and TRS)
Parallel voting (MMM) (Party-list PR and BV or PBV)
Parallel voting (MMM) (Party-list PR and SNTV)
Scorporo (MMM)
Majority bonus system (non-compensatory)
Majority jackpot system (compensatory)
Other
Some electoral systems elect a single winner to a unique position, such as prime minister, president or governor, while others elect multiple winners, such as members of parliament or boards of directors. When electing a legislature, areas may be divided into constituencies with one or more representatives or the electorate may elect representatives as a single unit. Voters may vote directly for an individual candidate or for a list of candidates put forward by a political party or alliance. There are many variations in electoral systems. The most common single-winner methods all fall under the plurality-with-runoff family, which includes first-preference plurality, two-round, ranked-choice runoff (RCV), and plurality-with-primaries. Many countries combine two or more electoral systems in superposition.
The mathematical and normative study of voting rules falls under the branches of economics called social choice and mechanism design, but the question has also engendered substantial contributions from political scientists, analytic philosophers, computer scientists, and mathematicians. The field has produced several major results, including Arrow's impossibility theorem (showing that ranked voting cannot eliminate the spoiler effect) and Gibbard's theorem (showing it is impossible to design a straightforward voting system, i.e. one where it is always obvious to a strategic voter which ballot they should cast).