Journal of Philosophical Logic

, Volume 35, Issue 6, pp 569–585 | Cite as

Logical Constraints on Judgement Aggregation

  • Marc Pauly
  • Martin van Hees


Logical puzzles like the doctrinal paradox raise the problem of how to aggregate individual judgements into a collective judgement, or alternatively, how to merge collectively inconsistent knowledge bases. In this paper, we view judgement aggregation as a function on propositional logic valuations, and we investigate how logic constrains judgement aggregation. In particular, we show that there is no non-dictatorial decision method for aggregating sets of judgements in a logically consistent way if the decision method is local, i.e., only depends on the individual judgements on the proposition under consideration.


Aggregation Function Decision Method Atomic Proposition Agenda Condition Social Choice Theory 
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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  1. 1.Department of PhilosophyStanford UniversityPalo AltoUSA
  2. 2.Department of PhilosophyUniversity of GroningenGroningenThe Netherlands

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