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Common Beliefs and the Existence of Speculative Trade

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  • Neeman, Zvika

Abstract

This paper shows that if rationality is not common knowledge, the no-trade theorem of Milgrom and Stokey (1982) fails to hold. We adopt Monderer and Samet's (1990) notion of common p-belief and show that when traders entertain doubts about the rationality of other traders, and even if these doubts are very small, arbitrarily large volumes of trade as well as rationality may be common p-belief for a large p. Furthermore, rationality and trade may simultaneously be known to arbitrary large (but finite) degree. The underlying intuition of the model is that, in trade situation, every trader may be rational but may believe tht the others are not fully rational. Thus, rational traders trade with each other, believeing that the other trader might be wrong, while they are right.
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Suggested Citation

  • Neeman, Zvika, 1996. "Common Beliefs and the Existence of Speculative Trade," Games and Economic Behavior, Elsevier, vol. 16(1), pages 77-96, September.
  • Handle: RePEc:eee:gamebe:v:16:y:1996:i:1:p:77-96
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    Cited by:

    1. Robin Hanson, 2003. "For Bayesian Wannabes, Are Disagreements Not About Information?," Theory and Decision, Springer, vol. 54(2), pages 105-123, March.
    2. Angrisani Marco & Guarino Antonio & Huck Steffen & Larson Nathan C, 2011. "No-Trade in the Laboratory," The B.E. Journal of Theoretical Economics, De Gruyter, vol. 11(1), pages 1-58, April.
    3. Luo, Xiao & Ma, Chenghu, 2003. ""Agreeing to disagree" type results: a decision-theoretic approach," Journal of Mathematical Economics, Elsevier, vol. 39(8), pages 849-861, November.
    4. Kukushkin, Nikolai S., 2015. "Robert Louis Stevenson's Bottle Imp: A strategic analysis," MPRA Paper 64639, University Library of Munich, Germany.
    5. Ann B. Gillette & Douglas E. Stevens & Susan G. Watts & Arlington W. Williams, 1999. "Price and Volume Reactions to Public Information Releases: An Experimental Approach Incorporating Traders' Subjective Beliefs," Contemporary Accounting Research, John Wiley & Sons, vol. 16(3), pages 437-479, September.
    6. Satoshi Fukuda, 2024. "On the consistency among prior, posteriors, and information sets," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 78(2), pages 521-565, September.
    7. Renou, Ludovic & Schlag, Karl H., 2010. "Minimax regret and strategic uncertainty," Journal of Economic Theory, Elsevier, vol. 145(1), pages 264-286, January.
    8. Gary Charness & Nuno Garoupa, 2000. "Reputation, Honesty, and Efficiency with Insider Information: an Experiment," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 9(3), pages 425-451, June.
    9. Romeo Matthew Balanquit, 2016. "Common Belief Revisited," UP School of Economics Discussion Papers 201608, University of the Philippines School of Economics.
    10. Robert M. Gillenkirch & Achim Hendriks & Susanne A. Welker, 2014. "Effects of Executive Compensation Complexity on Investor Behaviour in an Experimental Stock Market," European Accounting Review, Taylor & Francis Journals, vol. 23(4), pages 625-645, December.
    11. Gizatulina, Alia & Hellman, Ziv, 2019. "No trade and yes trade theorems for heterogeneous priors," Journal of Economic Theory, Elsevier, vol. 182(C), pages 161-184.
    12. Barelli, Paulo, 2009. "Consistency of beliefs and epistemic conditions for Nash and correlated equilibria," Games and Economic Behavior, Elsevier, vol. 67(2), pages 363-375, November.

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