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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 system 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.

Map showing the electoral systems used to elect candidates to the lower or sole (unicameral) house of national legislatures, as of January 2022.
Majoritarian system, single-winner districts
  First-past-the-post voting (single-member plurality)
  Two-round system (runoff)
  Instant-runoff voting (alternative vote)
Majoritarian system, multi-winner districts
  Plurality-at-large voting (block voting)
  General ticket (party block voting)
Semi-proportional system
  Modified Borda count

Proportional system
      Party-list proportional representation
Mixed system
    Mixed-member proportional representation
      Mixed-member majoritarian representation
    Majority bonus/jackpot system
  No election
  Varies by state
  No information

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. Voters may vote directly for individual candidates or for a list of candidates put forward by a political party or alliance. There are many variations in electoral systems, with the most common systems being first-past-the-post voting, block voting, the two-round (runoff) system, proportional representation and ranked voting. Some electoral systems, such as mixed systems, attempt to combine the benefits of non-proportional and proportional systems.

The study of formally defined electoral methods is called social choice theory or voting theory, and this study can take place within the field of political science, economics, or mathematics, and specifically within the subfields of game theory and mechanism design. Impossibility proofs such as Arrow's impossibility theorem demonstrate that when voters have three or more alternatives, no preferential voting system can guarantee the race between two candidates remains unaffected when an irrelevant candidate participates or drops out of the election.