Introduction to Judgment Aggregation

30 Pages Posted: 6 Feb 2010

See all articles by Christian List

Christian List

LMU Munich; London School of Economics

Ben Polak

Yale University - Department of Economics

Date Written: February 5, 2010


This introduces the symposium on judgment aggregation. The theory of judgment ag­gregation asks how several individuals' judgments on some logically connected propositions can be aggregated into consistent collective judgments. The aim of this intro­duction is to show how ideas from the familiar theory of preference aggregation can be extended to this more general case. We first translate a proof of Arrow's impos­sibility theorem into the new setting, so as to motivate some of the central concepts and conditions leading to analogous impossibilities, as discussed in the symposium. We then consider each of four possible escape-routes explored in the symposium.

Keywords: Judgment aggregation, Arrow's theorem, Escape routes

JEL Classification: D7, D71

Suggested Citation

List, Christian and Polak, Benjamin, Introduction to Judgment Aggregation (February 5, 2010). Cowles Foundation Discussion Paper No. 1753, Available at SSRN: or

Christian List

LMU Munich ( email )


London School of Economics ( email )

United Kingdom

Benjamin Polak (Contact Author)

Yale University - Department of Economics ( email )

28 Hillhouse Ave
New Haven, CT 06520-8268
United States
203-432-3590 (Phone)
203-432-5779 (Fax)

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