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On the informational efficiency of simple scoring rules

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Author Info

  • GOERTZ, Johanna M.
  • MANIQUET, François

    () (Université catholique de Louvain (UCL). Center for Operations Research and Econometrics (CORE))

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

Paper provided by Université catholique de Louvain, Center for Operations Research and Econometrics (CORE) in its series CORE Discussion Papers with number 2009026.

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Date of creation: 01 Apr 2009
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Handle: RePEc:cor:louvco:2009026

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Related research

Keywords: efficient information aggregation; scoring rules; Poisson games; approval voting;

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Cited by:
  1. Laurent Bouton & Micael Castanheira De Moura & A. Llorente-Saguer, 2012. "Divided Majority and Information Aggregation: Theory and Experiment," ULB Institutional Repository 2013/136800, ULB -- Universite Libre de Bruxelles.
  2. Laurent Bouton & Micael Castanheira, 2012. "One Person, Many Votes: Divided Majority and Information Aggregation," Econometrica, Econometric Society, vol. 80(1), pages 43-87, 01.
  3. Johanna Goertz & Francois Maniquet, 2011. "On a Three-Alternative Condorcet Jury Theorem," CESifo Working Paper Series 3457, CESifo Group Munich.

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