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Common Knowledge and Disparate Priors: When it is O.K. to Agree to Disagree

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Author Info
Hellman, Ziv

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Abstract

Abandoning the oft-presumed common prior assumption, partitioned type spaces with disparate priors are studied. It is shown that in the two-player case, a unique fundamental pair of priors can be identified in each type space, from whose properties boundaries on the possible ranges of expected values under common knowledge can be derived. In the limit as the elements of this pair approach each other,a common prior is identified, and standard results stemming from the common prior assumption are recapitulated. It is further shown that this two-player fundamental pair of priors is a special case of the n-player situation, where a representative n-tuple of fundamentally associated priors can be selected, out of at most n-1 such n-tuples, to play an analogous role.

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File URL: http://mpra.ub.uni-muenchen.de/3404/
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Paper provided by University Library of Munich, Germany in its series MPRA Paper with number 3404.

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Date of creation: 15 May 2007
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Handle: RePEc:pra:mprapa:3404

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Related research
Keywords: common knowledge heterogeneous prior beliefs common prior assumption

Find related papers by JEL classification:
D84 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Expectations; Speculations
C70 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - General
D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information

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Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. Faruk Gul, 1998. "A Comment on Aumann's Bayesian View," Econometrica, Econometric Society, vol. 66(4), pages 923-928, July.
  2. John Geanakoplos & Heracles M. Polemarchakis, 1982. "We Can't Disagree Forever," Cowles Foundation Discussion Papers 639, Cowles Foundation, Yale University. [Downloadable!]
  3. Geanakoplos, John D. & Polemarchakis, Heraklis M., 1982. "We can't disagree forever," Journal of Economic Theory, Elsevier, vol. 28(1), pages 192-200, October. [Downloadable!] (restricted)
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