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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.

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File URL: http://ftp.itam.mx/pub/academico/inves/martinelli/00-04.pdf
File Function: First version, 2000
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Bibliographic Info

Paper provided by Centro de Investigacion Economica, ITAM in its series Working Papers with number 0004.

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Length: 26 pages
Date of creation: Sep 2000
Date of revision:
Handle: RePEc:cie:wpaper:0004

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  1. Roger B. Myerson, 1994. "Extended Poisson Games and the Condorcet Jury Theorem," Discussion Papers 1103, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  2. Roger B. Myerson, 2000. "Comparison of Scoring Rules in Poisson Voting Games," Econometric Society World Congress 2000 Contributed Papers 0686, Econometric Society.
  3. Timothy Feddersen & Wolfgang Pesendorfer, 1994. "Voting Behavior and Information Aggregation in Elections with Private Information," Discussion Papers 1117, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  4. Feddersen, Timothy J & Pesendorfer, Wolfgang, 1996. "The Swing Voter's Curse," American Economic Review, American Economic Association, vol. 86(3), pages 408-24, June.
  5. 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.
  6. Stephen Wright & William Riker, 1989. "Plurality and runoff systems and numbers of candidates," Public Choice, Springer, vol. 60(2), pages 155-175, February.
  7. Timothy J. Fedderson & Wolfgang Pesendorfer, 1996. "Abstention in Elections with Asymmetric Information and Diverse Preferences," Discussion Papers 1195, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
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Cited by:
  1. Laurent Bouton & Gabriele Gratton, 2013. "Majority Runoff Elections: Strategic Voting and Duverger's Hypothesis," Discussion Papers 2013-23, School of Economics, The University of New South Wales.
  2. Jeffrey O’Neill, 2007. "Choosing a runoff election threshold," Public Choice, Springer, vol. 131(3), pages 351-364, June.
  3. Laurent Bouton, 2012. "A Theory of Strategic Voting in Runoff Elections," Boston University - Department of Economics - Working Papers Series WP2012-001, Boston University - Department of Economics.
  4. Bouton, Laurent & Castanheira, Micael & Llorente-Saguer, Aniol, 2012. "Divided Majority and Information Aggregation: Theory and Experiment," CEPR Discussion Papers 9234, C.E.P.R. Discussion Papers.
  5. Bouton, Laurent & Castanheira, Micael, 2008. "One Person, Many Votes: Divided Majority and Information Aggregation," CEPR Discussion Papers 6695, C.E.P.R. Discussion Papers.
  6. P. Amorós & Ricardo Martínez & M. Socorro Puy, 2013. "The closed primaries versus the top-two primary," Economics Working Papers we1319, Universidad Carlos III, Departamento de Economía.
  7. 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).

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