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Rationalizable Information Equilibria

Listed author(s):
  • Alexander Zimper

    ()

    (Department of Economics, University of Pretoria, Pretoria, South Africa and Kiel Institute for the World Economy)

Rational expectations equilibria (REE) assume that the ex post equilibrium price function is able to reveal ex ante information. This paper drops the assumption of information revealing prices and instead constructs an internal reasoning process through which highly rational price-takers can infer information from other market participants under the assumption that their utility maximization problems are common knowledge. Based on this reasoning process, we introduce the novel competitive equilibrium concept of rationalizable information equilibria (RIE). Our formal analysis establishes that (i) the RIE concept amounts to a refinement of the (generalized) REE concept whereby (ii) REE with interior net-trades are generically RIE.

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File URL: http://www.up.ac.za/media/shared/61/WP/wp_2017_45.zp121192.pdf
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Paper provided by University of Pretoria, Department of Economics in its series Working Papers with number 201745.

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Length: 40 pages
Date of creation: Jun 2017
Handle: RePEc:pre:wpaper:201745
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PRETORIA, 0002

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Web page: http://www.up.ac.za/economics

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  1. Radner, Roy, 1979. "Rational Expectations Equilibrium: Generic Existence and the Information Revealed by Prices," Econometrica, Econometric Society, vol. 47(3), pages 655-678, May.
  2. Bernheim, B Douglas, 1984. "Rationalizable Strategic Behavior," Econometrica, Econometric Society, vol. 52(4), pages 1007-1028, July.
  3. Allen, Beth E, 1981. "Generic Existence of Completely Revealing Equilibria for Economies with Uncertainty when Prices Convey Information," Econometrica, Econometric Society, vol. 49(5), pages 1173-1199, September.
  4. Albert S. Kyle, 1989. "Informed Speculation with Imperfect Competition," Review of Economic Studies, Oxford University Press, vol. 56(3), pages 317-355.
  5. Moulin, Herve, 1984. "Dominance solvability and cournot stability," Mathematical Social Sciences, Elsevier, vol. 7(1), pages 83-102, February.
  6. Battigalli, Pierpaolo & Bonanno, Giacomo, 1999. "Recent results on belief, knowledge and the epistemic foundations of game theory," Research in Economics, Elsevier, vol. 53(2), pages 149-225, June.
  7. Tirole, Jean, 1982. "On the Possibility of Speculation under Rational Expectations," Econometrica, Econometric Society, vol. 50(5), pages 1163-1181, September.
  8. Sanford J. Grossman, 1981. "An Introduction to the Theory of Rational Expectations Under Asymmetric Information," Review of Economic Studies, Oxford University Press, vol. 48(4), pages 541-559.
  9. Pearce, David G, 1984. "Rationalizable Strategic Behavior and the Problem of Perfection," Econometrica, Econometric Society, vol. 52(4), pages 1029-1050, July.
  10. Lucas, Robert E, Jr, 1978. "Asset Prices in an Exchange Economy," Econometrica, Econometric Society, vol. 46(6), pages 1429-1445, November.
  11. Geanakoplos, John, 1990. "An introduction to general equilibrium with incomplete asset markets," Journal of Mathematical Economics, Elsevier, vol. 19(1-2), pages 1-38.
  12. Frank Heinemann, 1997. "Rationalizable expectations and sunspot equilibria in an overlapping-generations economy," Journal of Economics, Springer, vol. 65(3), pages 257-277, October.
  13. Sanford J. Grossman, 1977. "The Existence of Futures Markets, Noisy Rational Expectations and Informational Externalities," Review of Economic Studies, Oxford University Press, vol. 44(3), pages 431-449.
  14. Zimper, Alexander, 2006. "Uniqueness conditions for strongly point-rationalizable solutions to games with metrizable strategy sets," Journal of Mathematical Economics, Elsevier, vol. 42(6), pages 729-751, September.
  15. Fama, Eugene F, 1970. "Efficient Capital Markets: A Review of Theory and Empirical Work," Journal of Finance, American Finance Association, vol. 25(2), pages 383-417, May.
  16. Beth Allen & James S. Jordan, 1998. "The existence of rational expectations equilibrium: a retrospective," Staff Report 252, Federal Reserve Bank of Minneapolis.
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