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Strategy-proof judgment aggregation

Dietrich, Franz and List, Christian (2007) Strategy-proof judgment aggregation. Economics and Philosophy, 23 (3). pp. 269-300. ISSN 1474-0028

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Abstract

Which rules for aggregating judgments on logically connected propositions are manipulable and which not? In this paper, we introduce a preference-free concept of non-manipulability and contrast it with a preference-theoretic concept of strategy-proofness. We characterize all non-manipulable and all strategy-proof judgment aggregation rules and prove an impossibility theorem similar to the Gibbard--Satterthwaite theorem. We also discuss weaker forms of non-manipulability and strategy-proofness. Comparing two frequently discussed aggregation rules, we show that “conclusion-based voting” is less vulnerable to manipulation than “premise-based voting”, which is strategy-proof only for “reason-oriented” individuals. Surprisingly, for “outcome-oriented” individuals, the two rules are strategically equivalent, generating identical judgments in equilibrium. Our results introduce game-theoretic considerations into judgment aggregation and have implications for debates on deliberative democracy.

Item Type: Article
Official URL: http://journals.cambridge.org/action/displayJourna...
Additional Information: © 2007 Cambridge University Press
Library of Congress subject classification: H Social Sciences > H Social Sciences (General)
B Philosophy. Psychology. Religion > B Philosophy (General)
H Social Sciences > HB Economic Theory
Sets: Departments > Government
Collections > Economists Online
Research centres and groups > Centre for Philosophy of Natural and Social Science (CPNSS)
Rights: http://www.lse.ac.uk/library/usingTheLibrary/academicSupport/OA/depositYourResearch.aspx
Date Deposited: 22 Jun 2008 13:56
URL: http://eprints.lse.ac.uk/5812/

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