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Divided Majority and Information Aggregation: Theory and Experiment

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  • Bouton, Laurent
  • Castanheira, Micael
  • Llorente-Saguer, Aniol

Abstract

This paper both theoretically and experimentally studies the properties of plurality and approval voting when the majority is divided as a result of information imperfections. The minority backs a third alternative, which the majority views as strictly inferior. The majority thus faces two problems: aggregating information and coordinating to defeat the minority candidate. Two types of equilibria coexist under plurality: either voters aggregate information, but this requires splitting their votes, or they coordinate but cannot aggregate information. With approval voting, expected welfare is strictly higher, because some voters multiple vote to achieve both goals at once. In the laboratory, we observe both types of equilibrium under plurality. Which one is selected depends on the size of the minority. Approval voting vastly outperforms plurality. Finally, subject behavior suggests the need to study asymmetric equilibria.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 9234.

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Date of creation: Nov 2012
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Handle: RePEc:cpr:ceprdp:9234

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Keywords: Approval Voting; Experiments; Multicandidate Elections; Plurality;

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Cited by:
  1. Martin Gregor, 2013. "The Optimal Ballot Structure for Double-Member Districts," CERGE-EI Working Papers wp493, The Center for Economic Research and Graduate Education - Economic Institute, Prague.

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