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Simple plurality versus plurality runoff with privately informed voters

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  • César Martinelli

    (Centro de Investigación Económica, Instituto Tecnológico Autónomo de México, México, D.F. 10700)

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, they increase the probability that the winner of the election is not one of their favorite candidates. 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

  • César Martinelli, 2002. "Simple plurality versus plurality runoff with privately informed voters," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 19(4), pages 901-919.
    • Handle: RePEc:spr:sochwe:v:19:y:2002:i:4:p:901-919
    Note: Received: 12 September 2000/Accepted: 8 November 2001
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    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. 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.
    3. Matías Núñez & Dimitrios Xefteris, 2017. "Electoral Thresholds as Coordination Devices," Scandinavian Journal of Economics, Wiley Blackwell, vol. 119(2), pages 346-374, April.
    4. 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).
    5. Bouton, Laurent & Gratton, Gabriele, 2015. "Majority runoff elections: strategic voting and Duverger's hypothesis," Theoretical Economics, Econometric Society, vol. 10(2), May.
    6. 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.
    7. Dhillon, Amrita & Kotsialou, Grammateia & Xefteris, Dimitris, 2021. "Information Aggregation with Delegation of Votes," SocArXiv ubk7p, Center for Open Science.
    8. Laurent Bouton & Jorge Gallego & Aniol Llorente-Saguer & Rebecca Morton, 2022. "Run-off Elections in the Laboratory," The Economic Journal, Royal Economic Society, vol. 132(641), pages 106-146.
    9. Jeffrey O’Neill, 2007. "Choosing a runoff election threshold," Public Choice, Springer, vol. 131(3), pages 351-364, June.
    10. 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.
    11. 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.
    12. Laurent Bouton, 2013. "A Theory of Strategic Voting in Runoff Elections," American Economic Review, American Economic Association, vol. 103(4), pages 1248-1288, June.
    13. Tsakas, Nikolas & Xefteris, Dimitrios, 2021. "Information aggregation with runoff voting," Journal of Economic Theory, Elsevier, vol. 191(C).
    14. Torres, Javier & Díaz, Guillermo, 2019. "Effects of runoff voting rules on number of parties and candidates' political experience: Evidence from a law change in Peru," European Journal of Political Economy, Elsevier, vol. 59(C), pages 97-107.
    15. Buisseret, Peter, 2017. "Electoral competition with entry under non-majoritarian run-off rules," Games and Economic Behavior, Elsevier, vol. 104(C), pages 494-506.
    16. Tsakas, Nikolas & Xefteris, Dimitrios, 2021. "Stress-testing the runoff rule in the laboratory," Games and Economic Behavior, Elsevier, vol. 128(C), pages 18-38.
    17. Laurent Bouton & Micael Castanheira, 2012. "One Person, Many Votes: Divided Majority and Information Aggregation," Econometrica, Econometric Society, vol. 80(1), pages 43-87, January.
    18. Pablo Amorós & M. Socorro Puy & Ricardo Martínez, 2016. "Closed primaries versus top-two primaries," Public Choice, Springer, vol. 167(1), pages 21-35, April.
    19. 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).
    20. 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.
    21. Adam Meirowitz, 2005. "Informational Party Primaries and Strategic Ambiguity," Journal of Theoretical Politics, , vol. 17(1), pages 107-136, January.
    22. Leontiou, Anastasia & Manalis, Georgios & Xefteris, Dimitrios, 2023. "Bandwagons in costly elections: The role of loss aversion," Journal of Economic Behavior & Organization, Elsevier, vol. 209(C), pages 471-490.

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