Duverger's Law Definition
The principle that plurality -rule elections (such as first past the post ) structured within single-member districts tend to favour a two-party system , and that "the double-ballot majority system and proportional representation tend to favor multipartism ."
Wiktionary
Origin of Duverger's Law
Attributed to Maurice Duverger, French sociologist who published on the subject in the 1950s and 1960s.
From Wiktionary
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