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Simple Plurality versus Plurality Runoff with Privately Informed Voters

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  • Cesar Martinelli

    (Centro de Investigacion Economica (CIE), Instituto Tecnologico Autonomo de Mexico (ITAM))

Abstract

This paper compares two voting methods commonly used in presidential elections: simple plurality voting and plurality runoff. In a situation in which a group of voters have common interests but do not agree on which candidate to support due to private information, information aggregation requires them to split their support between their favorite candidates. However, if a group of voters split their support between their favorite candidates, they increase the probability that the winner of the election is not one of them. In a model with three candidates, due to this tension between information aggregation and the need for coordination, plurality runoff leads to higher expected utility for the majority than simple plurality voting if the information held by voters about the candidates is not very accurate.

Suggested Citation

  • Cesar Martinelli, 2000. "Simple Plurality versus Plurality Runoff with Privately Informed Voters," Working Papers 0004, Centro de Investigacion Economica, ITAM.
  • Handle: RePEc:cie:wpaper:0004
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    References listed on IDEAS

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    5. Feddersen, Timothy J & Pesendorfer, Wolfgang, 1996. "The Swing Voter's Curse," American Economic Review, American Economic Association, vol. 86(3), pages 408-424, June.
    6. McKelvey, Richard D. & Ordeshook, Peter C., 1985. "Elections with limited information: A fulfilled expectations model using contemporaneous poll and endorsement data as information sources," Journal of Economic Theory, Elsevier, vol. 36(1), pages 55-85, June.
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    Cited by:

    1. Massimiliano Ferraresi & Leonzio Rizzo & Alberto Zanardi, 2015. "Policy outcomes of single and double-ballot elections," International Tax and Public Finance, Springer;International Institute of Public Finance, vol. 22(6), pages 977-998, December.
    2. Jeffrey O’Neill, 2007. "Choosing a runoff election threshold," Public Choice, Springer, vol. 131(3), pages 351-364, June.
    3. Pablo Amorós & M. Socorro Puy & Ricardo Martínez, 2016. "Closed primaries versus top-two primaries," Public Choice, Springer, vol. 167(1), pages 21-35, April.
    4. Bouton, Laurent & Castanheira, Micael & Llorente-Saguer, Aniol, 2016. "Divided majority and information aggregation: Theory and experiment," Journal of Public Economics, Elsevier, vol. 134(C), pages 114-128.
    5. J. Goertz, 2014. "Inefficient committees: small elections with three alternatives," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 43(2), pages 357-375, August.
    6. Laurent Bouton & Micael Castanheira, 2012. "One Person, Many Votes: Divided Majority and Information Aggregation," Econometrica, Econometric Society, vol. 80(1), pages 43-87, January.
    7. Amorós, P. & Martínez, Ricardo & Puy, M. Socorro, 2013. "The closed primaries versus the top-two primary," UC3M Working papers. Economics we1319, Universidad Carlos III de Madrid. Departamento de Economía.
    8. Bouton, Laurent & Gratton, Gabriele, 2015. "Majority runoff elections: strategic voting and Duverger's hypothesis," Theoretical Economics, Econometric Society, vol. 10(2), May.
    9. Menezes, Aline, 2017. "Do some electoral systems select better politicians than others? Single- vs dual-ballot elections," MPRA Paper 79370, University Library of Munich, Germany.
    10. Laurent Bouton, 2013. "A Theory of Strategic Voting in Runoff Elections," American Economic Review, American Economic Association, vol. 103(4), pages 1248-1288, June.
    11. Leonzio Rizzo & Alberto Zanardi, 2012. "Single vs double ballot and party coalitions: the impact on fiscal policy. Evidence from Italy," Working Papers 2012/33, Institut d'Economia de Barcelona (IEB).
    12. Patrick Hummel, 2014. "Pre-election polling and third party candidates," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 42(1), pages 77-98, January.
    13. repec:eee:gamebe:v:104:y:2017:i:c:p:494-506 is not listed on IDEAS

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