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One Person, Many Votes: Divided Majority and Information Aggregation

Laurent Bouton () and Micael Castanheira ()

ULB Institutional Repository from ULB -- Universite Libre de Bruxelles

Abstract: This paper shows that information imperfections and common values can solve coordination problems in multicandidate elections. We analyze an election in which (i) the majority is divided between two alternatives and (ii) the minority backs a third alternative, which the majority views as strictly inferior. Standard analyses assume voters have a fixed preference ordering over candidates. Coordination problems cannot be overcome in such a case, and it is possible that inferior candidates win. In our setup the majority is also divided as a result of information imperfections. The majority thus faces two problems: aggregating information and coordinating to defeat the minority candidate. We show that when the common value component is strong enough, approval voting produces full information and coordination equivalence: the equilibrium is unique and solves both problems. Thus, the need for information aggregation helps resolve the majority's coordination problem under approval voting. This is not the case under standard electoral systems.

JEL-codes: C72 D72 D81 D82 (search for similar items in EconPapers)
Date: 2012-01-10
New Economics Papers: this item is included in nep-cdm, nep-cta and nep-pol
Note: This is a translation of: One Person, Many Votes: Divided Majority and Information Aggregation
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Published in: Econometrica (2012) v.80 n° 1,p.43-87

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Related works:
Journal Article: One Person, Many Votes: Divided Majority and Information Aggregation (2012) Downloads
Working Paper: One Person, Many Votes: Divided Majority and Information Aggregation (2008) Downloads
Working Paper: One Person, Many Votes: Divided Majority and Information Aggregation (2008) Downloads
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