, Volume 55, Issue 2, pp 239–270

Instability Of Ex Post Aggregation In The Bolker–Jeffrey Framework And Related Instability Phenomena

  • Mathias Risse

DOI: 10.1023/A:1012933421686

Cite this article as:
Risse, M. Erkenntnis (2001) 55: 239. doi:10.1023/A:1012933421686


Suppose n Bayesian agents need to make a decision as a group. The groupas a whole is also supposed to be a Bayesian agent whose probabilities andutilities are derived or aggregated in reasonable ways from the probabilitiesand utilities of the group members. The aggregation could beex ante, i.e., interms of expected utilities, or it could be ex post, i.e., in terms of utilitiesonly, or in terms of utilities and probabilities separately. This study exploresthe ex post approach. Using the Bolker/Jeffrey framework, we show thatex post aggregation is subject to an instability phenomenon. That is, it mayhappen that the group preference between actions ``flips back and forth'' dependingon the level of detail in which the decision problem is described. Structurally verysimilar phenomena also occur elsewhere in social choice theory, in statistics (Simpson'sParadox), and in voting theory (Ostrogorski's Paradox).

Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Mathias Risse
    • 1
  1. 1.Department of PhilosophyYale UniversityNew HavenU.S.A.

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