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Party Cooperation and Duverger’s Law: A Game-theoretical Analysis of Pan-Blue Alliance

This paper investigates the relationship between political party cooperation and Duverger’s Law. A theoretical model is build in order to demonstrate whether two party leaders would cooperate or not and therefore nominate only one candidate to campaign. The results shed light on how Duverger’s law is satisfied through pre-election coordination between political parties. Under three assumptions, Duverger’s law is satisfied. Otherwise, candidates of three political parties will run election under the plurality electoral system.

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