Strategy-proof judgment aggregation
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 â€œconclusion-based votingâ€ is less vulnerable to manipulation than â€œpremise-based votingâ€ , which is strategy-proof only for â€œreason-orientedâ€ individuals. Surprisingly, for â€œoutcome-orientedâ€ 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.
|Date of creation:||2007|
|Date of revision:|
|Publication status:||Published in Economics and Philosophy, 2007, 23(3), pp. 269-300. ISSN: 1474-0028|
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