Duverger's law

Definitions

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 multipartyism.

Examples

“Out of that work⟳ emerged Duverger’s Law, which holds that single-member districts tend⟳ to produce⟳ two-party systems. […] And in the long run⟳, the inexorable machinery of Duverger’s Law will ensure that the Patriot Party is folded back into the Republican Party.”

CEFR level