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Agreeing to agree

  • Ehud Lehrer
  • Dov Samet

Aumann(1976) has shown that agents who have a common prior cannot have common knowledge of their posteriors for event E if these posteriors do not coincide. But given an event E, can the agents have posteriors with a common prior such that it is common knowledge that the posteriors for E *do* coincide? A necessary and sufficient condition for this is the existence of a nonempty *finite* event F with the following two properties. First, it is common knowledge at $F$ that the agents cannot tell whether or not $E$. Second, this still holds true at F, when F becomes common knowledge.

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File URL: http://128.118.178.162/eps/game/papers/0310/0310005.pdf
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Paper provided by EconWPA in its series Game Theory and Information with number 0310005.

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Length: 20 pages
Date of creation: 09 Oct 2003
Date of revision:
Handle: RePEc:wpa:wuwpga:0310005
Note: Type of Document - ; pages: 20
Contact details of provider: Web page: http://128.118.178.162

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  1. Milgrom, Paul & Stokey, Nancy, 1982. "Information, trade and common knowledge," Journal of Economic Theory, Elsevier, vol. 26(1), pages 17-27, February.
  2. Nielsen, Lars Tyge, et al, 1990. "Common Knowledge of an Aggregate of Expectations," Econometrica, Econometric Society, vol. 58(5), pages 1235-39, September.
  3. Morris, Stephen, 1994. "Trade with Heterogeneous Prior Beliefs and Asymmetric Information," Econometrica, Econometric Society, vol. 62(6), pages 1327-47, November.
  4. Dov Samet & Iddo Samet & David Schmeidler, 2003. "One Observation behind Two-Envelope Puzzles," Game Theory and Information 0310004, EconWPA.
  5. Klaus Nehring & Giacomo Bonanno & Massimiliano Marcellino, 2003. "Fundamental Agreement: A new foundation for the Harsanyi Doctrine," Working Papers 962, University of California, Davis, Department of Economics.
  6. Samet, Dov, 1998. "Common Priors and Separation of Convex Sets," Games and Economic Behavior, Elsevier, vol. 24(1-2), pages 172-174, July.
  7. Dov Samet, 1999. "Bayesianism without Learning," Game Theory and Information 9902004, EconWPA.
  8. Hart, Sergiu & Heifetz, Aviad & Samet, Dov, 1996. ""Knowing Whether," "Knowing That," and The Cardinality of State Spaces," Journal of Economic Theory, Elsevier, vol. 70(1), pages 249-256, July.
  9. Monderer, Dov & Samet, Dov, 1989. "Approximating common knowledge with common beliefs," Games and Economic Behavior, Elsevier, vol. 1(2), pages 170-190, June.
  10. Geanakoplos, John, 1994. "Common knowledge," Handbook of Game Theory with Economic Applications, in: R.J. Aumann & S. Hart (ed.), Handbook of Game Theory with Economic Applications, edition 1, volume 2, chapter 40, pages 1437-1496 Elsevier.
  11. Samet, Dov, 2000. "Quantified Beliefs and Believed Quantities," Journal of Economic Theory, Elsevier, vol. 95(2), pages 169-185, December.
  12. Heifetz, Aviad, 1996. "Comment on Consensus without Common Knowledge," Journal of Economic Theory, Elsevier, vol. 70(1), pages 273-277, July.
  13. Robert J. Aumann, 1999. "Interactive epistemology I: Knowledge," International Journal of Game Theory, Springer, vol. 28(3), pages 263-300.
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