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Eduncle Best Answer
Duverger’s theory asserts that a two party system emerges in a a majoritarian parliamentary system. Duverger’s law draws from a model of causality from electoral system to a party system. A proportional representation (PR) system creates electoral conditions that foster development of many parties, whereas a plurality system(example- First Past the Post System) marginalizes smaller political parties, generally resulting in a two-party system. Duverger laid out two paths by which plurality voting systems lead to fewer major parties: the “fusion” or alliance of weaker parties into more effective factions, and the “elimination” of weak parties as voters gradually desert them because they have no chance of winning and influencing governance.