CFDP 1753

Introduction to Judgment Aggregation


Publication Date: February 2010

Pages: 29


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.


Judgment aggregation, Arrow’s theorem, Escape routes

JEL Classification Codes:  D70, D71

See CFP: 1297