Common Beliefs and the Existence of Speculative Trade
AbstractThis 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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Bibliographic InfoArticle provided by Elsevier in its journal Games and Economic Behavior.
Volume (Year): 16 (1996)
Issue (Month): 1 (September)
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Web page: http://www.elsevier.com/locate/inca/622836
Other versions of this item:
- Zvika Neeman, 1993. "Common Beliefs and the Existence of Speculative Trade," Discussion Papers 1052, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
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.:
- D. Samet, 1987.
"Ignoring Ignorance and Agreeing to Disagree,"
749, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
- Zvika Neeman, 1993. "A Note on Approximating Agreeing to Disagree Results with Common p-Beliefs," Discussion Papers 1029, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
- Monderer, Dov & Samet, Dov, 1989. "Approximating common knowledge with common beliefs," Games and Economic Behavior, Elsevier, vol. 1(2), pages 170-190, June.
- Robin Hanson, 2003. "For Bayesian Wannabes, Are Disagreements Not About Information?," Theory and Decision, Springer, vol. 54(2), pages 105-123, March.
- Marco Angrisani & Antonio Guarino & Steffen Huck & Nathan Larson, 2008.
"No-Trade in the Laboratory,"
CESifo Working Paper Series
2436, CESifo Group Munich.
- 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.
- 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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