David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Synthese 140 (1-2):207 - 235 (2004)
The ``doctrinal paradox'' or ``discursive dilemma'' shows that propositionwise majority voting over the judgments held by multiple individuals on some interconnected propositions can lead to inconsistent collective judgments on these propositions. List and Pettit (2002) have proved that this paradox illustrates a more general impossibility theorem showing that there exists no aggregation procedure that generally produces consistent collective judgments and satisfies certain minimal conditions. Although the paradox and the theorem concern the aggregation of judgments rather than preferences, they invite comparison with two established results on the aggregation of preferences: the Condorcet paradox and Arrow's impossibility theorem. We may ask whether the new impossibility theorem is a special case of Arrow's theorem, or whether there are interesting disanalogies between the two results. In this paper, we compare the two theorems, and show that they are not straightforward corollaries of each other. We further suggest that, while the framework of preference aggregation can be mapped into the framework of judgment aggregation, there exists no obvious reverse mapping. Finally, we address one particular minimal condition that is used in both theorems – an independence condition – and suggest that this condition points towards a unifying property underlying both impossibility results.
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Citations of this work BETA
Fabienne Peter (2007). Rawls' Idea of Public Reason and Democratic Legitimacy. Journal of International Political Theory 3 (1):129-143.
Fabrizio Cariani, Marc Pauly & Josh Snyder (2008). Decision Framing in Judgment Aggregation. Synthese 163 (1):1 - 24.
Christian List (2012). The Theory of Judgment Aggregation: An Introductory Review. Synthese 187 (1):179-207.
Fabrizio Cariani (2011). Judgment Aggregation. Philosophy Compass 6 (1):22-32.
Christian List (2011). Group Communication and the Transformation of Judgments: An Impossibility Result. Journal of Political Philosophy 19 (1):1-27.
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