Institute for Logic, Language and Computation

25 November 2011, Computational Social Choice Seminar, Irem Bozbay

Speaker: Irem Bozbay
Title: Judgment Aggregation in Search for the Truth
Date: Friday 25 November 2011
Time: 16:00
Location: Room A1.14, Science Park 904, Amsterdam


We analyse the problem of aggregating judgments over multiple issues from the perspective of efficient aggregation of voters' private information. While new in judgment aggregation theory, this perspective is familiar in a different body of literature about voting between two alternatives when voters' disagreements stem (fully or partly) from conflicts of information rather than interests. Combining the two literatures, we consider a simple judgment aggregation problem and model the private information underlying voters' judgments. We analyse the resulting strategic incentives and determine which voting rules lead to collective judgments that efficiently use all private information, assuming that voters share a preference for true collective judgments. We find that in many, 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. This is joint work with Franz Dietrich and Hans Peters

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