Duverger's law
Winner-takes-all voting systems tend to result in only two viable parties / From Wikipedia, the free encyclopedia
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In political science, Duverger's law (/ˈduvərʒeɪ/ DOO-vər-zhay) refers to the observation that political systems with only one winner that fail the sincere favorite criterion typically result in two-party rule.[1][2] By contrast, systems that do not encourage lesser-evil voting or provide for proportional representation usually have more representation of minor parties in government.[3]