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Constraints and non-existence of rational expectations equilibria

Author

Listed:
  • José M. Marín
  • Jacques Olivier

Abstract

In this article we show that in the presence of trading constraints, such as short sale constraints, the standard definition of a Rational Expectations Equilibrium allows for equilibrium prices that reveal information unknown to any active trader in the market. We propose a new definition of the Rational Expectations Equilibrium that incorporates a stronger measurability condition than measurability with respect to the join of the information sets of the agents and give an example of non-existence of equilibrium. The example is robust to perturbations on the data of the economy and the introduction of new assets.

Suggested Citation

  • José M. Marín & Jacques Olivier, 1997. "Constraints and non-existence of rational expectations equilibria," Economics Working Papers 225, Department of Economics and Business, Universitat Pompeu Fabra.
    • Handle: RePEc:upf:upfgen:225
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    More about this item

    Keywords

    Rational expectations; short sale constraints; existence of equilibrium;
    All these keywords.

    JEL classification:

    • D40 - Microeconomics - - Market Structure, Pricing, and Design - - - General
    • D46 - Microeconomics - - Market Structure, Pricing, and Design - - - Value Theory
    • D50 - Microeconomics - - General Equilibrium and Disequilibrium - - - General
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates

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