"Ambiguity and Rational Expectations Equilibria"

Abstract
This paper demonstrates the existence and robustness of partially-revealing rational expectations equilibria (REE) in general exchange economies when some traders have ambiguity averse preferences. Further, the generic existence of fully-revealing REE is proven for a commonly-used subset of the class of ambiguity averse preferences. This finding illustrates that models with ambiguity aversion provide a relatively tractable framework through which partial information revelation may be studied in a general equilibrium setting without relying on particular distributional or von Neumann-Morgenstern utility assumptions or the presence of 'noise'.

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