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The Condorcet Jur(ies) Theorem

  • Ahn, David S.
  • Oliveros, Santiago

Should two issues be decided jointly by a single committee or in separately by different committees? Similarly, should two defendants be tried together in a joint trial or tried separately in severed trials? Multiplicity of issues or defendants introduces novel strategic considerations. As in the standard Condorcet Jury Theorem, we consider large committees with common values and incomplete information. Our main result is that the joint trial by a single committee can aggregate information if and only if the severed trials by separate committees can aggregate information. Specifically, suppose that either for the joint trial or for the severed trials there exists a sequence of equilibria that implements the optimal outcome with probability approaching one as the number of voters goes to infinity. Then a sequence of equilibria with similar asymptotic efficiency exists for the other format. Thus, the advantage of either format cannot hinge on pure information aggregation with many signals.

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

Volume (Year): 150 (2014)
Issue (Month): C ()
Pages: 841-851

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Handle: RePEc:eee:jetheo:v:150:y:2014:i:c:p:841-851
Contact details of provider: Web page: http://www.elsevier.com/locate/inca/622869

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  1. Geoffroy de Clippel & Kfir Eliaz, 2012. "Premise-Based versus Outcome-Based Information Aggregation," Working Papers 2012-10, Brown University, Department of Economics.
  2. David S. Ahn & Santiago Oliveros, 2010. "Combinatorial Voting," Levine's Working Paper Archive 661465000000000263, David K. Levine.
  3. List, Christian & Polak, Ben, 2010. "Introduction to judgment aggregation," Journal of Economic Theory, Elsevier, vol. 145(2), pages 441-466, March.
  4. John List & Matti Liski, 2005. "Introduction," Environmental & Resource Economics, European Association of Environmental and Resource Economists, vol. 31(2), pages 121-121, 06.
  5. Bozbay, Irem, 2012. "Truth-Seeking Judgment Aggregation over Interconnected Issues," Working Papers 2012:31, Lund University, Department of Economics.
  6. Bozbay, İrem & Dietrich, Franz & Peters, Hans, 2014. "Judgment aggregation in search for the truth," Games and Economic Behavior, Elsevier, vol. 87(C), pages 571-590.
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