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On the informational efficiency of simple scoring rules

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Author Info

  • Goertz, Johanna M.M.
  • Maniquet, François

Abstract

We study information aggregation in large elections. With two candidates, efficient information aggregation is possible (e.g., Feddersen and Pesendorfer [5], [6] and [7]). We show that this result does not extend to elections with more than two candidates. We study a class of simple scoring rules in voting games with Poisson population uncertainty and three candidates. No simple scoring rule aggregates information efficiently, even if preferences are dichotomous and a Condorcet winner always exists. We introduce a weaker criterion of informational efficiency that requires a voting rule to have at least one efficient equilibrium. Only approval voting satisfies this criterion.

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Bibliographic Info

Article provided by Elsevier in its journal Journal of Economic Theory.

Volume (Year): 146 (2011)
Issue (Month): 4 (July)
Pages: 1464-1480

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Handle: RePEc:eee:jetheo:v:146:y:2011:i:4:p:1464-1480

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Web page: http://www.elsevier.com/locate/inca/622869

Related research

Keywords: Efficient information aggregation Scoring rules Poisson games Approval voting;

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Cited by:
  1. Sébastien Courtin & Matias Nunez, 2013. "A Map of Approval Voting Equilibria Outcomes," THEMA Working Papers 2013-31, THEMA (THéorie Economique, Modélisation et Applications), Université de Cergy-Pontoise.
  2. Matias Nunez & Jean-Francois Laslier, 2013. "Preference Intensity Representation : Strategic Overstating in Large Elections," Post-Print hal-00917099, HAL.
  3. Micael Castanheira De Moura & Laurent Bouton, 2012. "One Person, Many Votes: Divided Majority and Information Aggregation," ULB Institutional Repository 2013/108675, ULB -- Universite Libre de Bruxelles.
  4. Sébastien Courtin & Matias Nùnez, 2013. "Dominance Solvable Approval Voting Games," THEMA Working Papers 2013-27, THEMA (THéorie Economique, Modélisation et Applications), Université de Cergy-Pontoise.
  5. David S. Ahny & Santiago Oliveros, 2013. "Approval Voting and Scoring Rules with Common Values," Economics Discussion Papers 732, University of Essex, Department of Economics.
  6. GOERTZ, Johanna & MANIQUET, François, 2013. "Large elections with multiple alternatives: a Condorcet Jury Theorem and inefficient equilibria," CORE Discussion Papers 2013023, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  7. Johanna Goertz & Francois Maniquet, 2011. "On a Three-Alternative Condorcet Jury Theorem," CESifo Working Paper Series 3457, CESifo Group Munich.
  8. Francois Maniquet & Massimo Morelli, 2010. "Approval Quorums Dominate Participation Quorums," Economics Working Papers ECO2010/13, European University Institute.
  9. Arnaud Dellis & Mandar Oak, 2013. "Multiple Votes, Multiple Candidacies and Polarization," School of Economics Working Papers 2013-02, University of Adelaide, School of Economics.
  10. Laurent Bouton & Micael Castanheira & Aniol Llorente-Saguer, 2012. "Divided Majority and Information Aggregation: Theory and Experiment," Working Paper Series of the Max Planck Institute for Research on Collective Goods 2012_20, Max Planck Institute for Research on Collective Goods.
  11. Matias Nunez, 2013. "The Strategic Sincerity of Approval Voting," Post-Print hal-00917101, HAL.

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