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Rationalizable Expectations

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Author Info
Elchanan Ben-Porath ()
Aviad Heifetz ()
Abstract

Consider an exchange economy with asymmetric information. What is the set of outcomes that are consistent with common knowledge of rationality and market clearing? We propose the concept of CKRMC as an answer to this question. The set of price functions that are CKRMC is the maximal set F with the property that every f?F defi?nes prices that clear the markets for demands that can be rationalized by some profile of subjective beliefs on F. Thus, the difference between CKRMC and Rational Expectations Equilibrium (REE) is that CKRMC allows for a situation where the agents do not know the true price function and furthermore may have different beliefs about it. We characterize CKRMC, study its properties, and apply it to a general class of economies with two commodities. CKRMC manifests intuitive properties that stand in contrast to the full revelation property of REE. In particular, we obtain that for a broad class of economies: (1) There is a whole range of prices that are CKRMC in every state. (2) The set of CKRMC outcomes is monotonic with the amount of information in the economy.

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Paper provided by Center for Rationality and Interactive Decision Theory, Hebrew University, Jerusalem in its series Discussion Paper Series with number dp461.

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Length: 40 pages
Date of creation: Nov 2006
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Handle: RePEc:huj:dispap:dp461

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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. Stephen Morris, . "Justifying Rational Expectations," Penn CARESS Working Papers 9c26245814018c6e9fadb3767, UCLA Department of Economics. [Downloadable!]
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  2. Desgranges, G. & Guesnerie, R., 1996. "Common knowledge and the information revealed through prices: some conjectures," DELTA Working Papers 96-22, DELTA (Ecole normale supérieure).
  3. R. Guesnerie, 2002. "Anchoring Economic Predictions in Common Knowledge," Econometrica, Econometric Society, vol. 70(2), pages 439-480, March. [Downloadable!] (restricted)
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  1. Elchanan Ben-Porath, 2007. "Trade with Heterogeneous Beliefs," Discussion Paper Series dp462, Center for Rationality and Interactive Decision Theory, Hebrew University, Jerusalem. [Downloadable!]
  2. Elchanan Ben-Porath, 2007. "Trade with Heterogeneous Beliefs," Levine's Bibliography 122247000000001494, UCLA Department of Economics. [Downloadable!]
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