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Rational Expectations Equilibrium: Generic Existence and the Information Revealed by Prices

Roy Radner

Abstract

When traders come to a market with different information about the items to be traded, the resulting market prices may reveal to some traders information originally available only to others. The possibility for such inferences rests upon traders having "models" or "expectations" of how equilibrium prices are related to initial information. This relationship is endogenous, which motivates the term "rational expectations equilibrium." This paper shows that, in a particular model of asset trading, if the number of alternative states of initial information is finite then, generically, rational expectations equilibria exist that reveal to all traders all of their initial information.