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Plurality voting is the most common voting system, and has been in widespread use since the earliest democracies.As plurality voting has exhibited weaknesses from its start, especially as soon as a third party joins the race, some individuals turned to transferable votes (facilitated by contingent ranked ballots) to reduce the incidence of wasted votes and unrepresentative election results.
Ranked-choice voting (RCV) can refer to one of several ranked voting methods used in some cities and states in the United States. The term is not strictly defined, but most often refers to instant-runoff voting (IRV) or single transferable vote (STV), the main difference being whether only one winner or multiple winners are elected.
Ranked-choice voting may be used as a synonym for: Ranked voting, a term used for any voting system in which voters are asked to rank candidates in order of preference; Instant-runoff voting (IRV), a specific ranked voting system with single-winner districts; Single transferable vote (STV), a specific ranked voting system with multi-winner ...
Quadratic voting is unusual in that it is a cardinal voting system that does not allow independent scoring of candidates. Cumulative voting could be classified as a cardinal rule with unconditional spoiler effects. STAR (score then automatic runoff) is a hybrid of ranked and rated voting systems. It chooses the top 2 candidates by score voting ...
Evaluations of this type are commonest for single-winner electoral systems. Ranked voting systems fit most naturally into the framework, but other types of ballot (such a FPTP and Approval voting) can be accommodated with lesser or greater effort. The evaluation protocol can be varied in a number of ways:
Instant-runoff voting (IRV; US: ranked-choice voting (RCV), AU: preferential voting, UK/NZ: alternative vote) is a single-winner, multi-round elimination rule that uses ranked voting to simulate a series of runoff elections. In each round, the candidate with the fewest first-preferences (among the remaining candidates) is eliminated. This ...
The use of game theory to analyze electoral systems led to discoveries about the effects of certain methods. Earlier developments such as Arrow's impossibility theorem had already shown the issues with ranked voting systems. Research led Steven Brams and Peter Fishburn to formally define and promote the use of approval voting in 1977. [28]
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.. Some electoral systems elect a single winner (single candidate or option), while others elect multiple winners, such as members of parliament or boards of directors.