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Judgment aggregation in search for the truth

Abstract : We analyse the problem of aggregating judgments over multiple issues from the perspective of whether aggregate judgments manage to efficiently use all voters' private information. While new in judgment aggregation theory, this perspective is familiar in a different body of literature about voting between two alternatives where voters' disagreements stem from conflicts of information rather than interests. Combining the two bodies of literature, we consider a simple judgment aggregation problem and model the private information underlying voters' judgments. Assuming that voters share a preference for true collective judgments, we analyse the resulting strategic incentives and determine which voting rules efficiently use all private information. We find that in certain, but not all cases a quota rule should be used, which decides on each issue according to whether the proportion of 'yes' votes exceeds a particular quota.
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https://halshs.archives-ouvertes.fr/halshs-00978030
Contributor : Franz Dietrich <>
Submitted on : Friday, April 11, 2014 - 10:02:11 PM
Last modification on : Tuesday, November 17, 2020 - 11:18:13 AM

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Irem Bozbay, Franz Dietrich, Hans Peters. Judgment aggregation in search for the truth. Games and Economic Behavior, Elsevier, 2014, pp.571-590. ⟨10.1016/j.geb.2014.02.007⟩. ⟨halshs-00978030⟩

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