Which of the following electoral systems tends to result in multiple political parties?

proportional representation, electoral system that seeks to create a representative body that reflects the overall distribution of public support for each political party. Where majority or plurality systems effectively reward strong parties and penalize weak ones by providing the representation of a whole constituency to a single candidate who may have received fewer than half of the votes cast (as is the case, for example, in the United States), proportional representation ensures minority groups a measure of representation proportionate to their electoral support. Systems of proportional representation have been adopted in many countries, including Belgium, Denmark, Finland, Greece, Hungary, Israel, Italy, Luxembourg, Norway, Russia, Spain, Sweden, and Switzerland.

Development and debates

Advocates for proportional representation argue that an election is like a census of opinion as to how the country should be governed, and only if an assembly represents the full diversity of opinion within a country can its decisions be regarded as legitimate. For example, proponents maintain that the plurality system can produce unrepresentative, minority governments, such as in the United Kingdom, where the two major parties governed the country for the last three decades of the 20th century with little more than 40 percent of the votes. The proportional system also is suggested as a means of redressing the possible anomaly arising under majority or plurality systems whereby a party may win more seats with fewer popular votes than its opponents, as occurred in the British elections of 1951 and February 1974.

Critics of proportional representation contend that in an election a country is making a decision, and the function of the electoral system is to achieve a consensus rather than a census of opinion. Opponents argue further that, by making it possible for small parties to be represented, proportional representation encourages the formation of splinter parties that can result in weak and unstable government.

Unlike the plurality system, which uses single-member districts, proportional representation systems use multimember constituencies. Systematic methods of applying proportional representation were first developed in the mid-19th century in Denmark by Carl Andrae and in Britain by Thomas Hare and John Stuart Mill. Methods currently in use include the single-transferable-vote method (STV), the party-list system, and the additional-member system.

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