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Winner-take-all system

System favoring larger parties over smaller ones

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Through Candidate, Political party and Proportional representation

Winner-take-all systems are criticized by economists, political scientists, and citizen activist groups for allowing potentially disproportionate and undemocratic results, as small pluralities can obtain complete power over a governing body, leaving the majority of voters unrepresented. Furthermore, political scientist Maurice Duverger argued that winner-take-all systems lead to two-party systems, a theory termed Duverger's Law.

Definition and types

A voting system is winner-take-all if representation is only awarded to the candidate with the largest vote share. Since single-winner voting systems can only select one winner to represent all voters in a given body or district, all such systems are by definition winner-take-all. This includes both first-past-the-post and single-winner ranked voting methods.

A multi-winner voting system can still be winner-take-all if a plurality of voters can coordinate to only elect representation for themselves. This includes plurality block voting, where voters can select as many candidates as there are open positions, and can win all seats by simply selecting all the candidates of their preferred party. In addition, although single non-transferable voting systems can produce results where a plurality elects every seat, this requires poor coordination of minority factions, so it is not strictly winner-take-all.

If the members of a body of representatives are each elected from a winner-take-all electoral district, the system as a whole may not reflect the winner-take-all principle wherein the party with the most votes, whether plurality or majority, receives all or even most of the seats. If a sufficient number of votes from the plurality or majority are wasted in each district (see gerrymandering) a minority of voters can win a majority of seats in the governing body. (see also electoral inversion)

The principle of majoritarian democracy does not necessarily imply that a winner-take-all electoral system needs to be used, in fact, using proportional systems to elect legislature usually better serve this principle as such aims to ensures that the legislature accurately reflects the whole population, not just the winners of the election and the majority rule is then used within the legislature. The most widely accepted modern views of representative democracy no longer consider winner-take-all representation to be democratic. For this reason, nowadays winner-take-all representation is most often used in single-winner districts, which allows nationwide minorities to gain representation if they make up a plurality or majority in at least one district, but some also consider this anti-democratic because of the possibility of an electoral inversion (like in the case of some US presidential elections: 2000, 2016).

Winner-take-all and proportional systems are the most commonly used voting system worldwide, followed by mixed electoral systems, which usually combine winner-take-all and proportional representation, although there are mixed system that combine two winner-take-all systems as well. Winner-take-all representation is also contrasted with proportional representation, which provides for representation of political minorities according to their share of the popular vote and semi-proportional representation, which inherently provides for some representation of minorities (at least above a certain threshold). Within mixed systems, mixed-member majoritarian representation (also known as parallel voting) provides semi-proportional representation, as opposed to mixed-member proportional systems.

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