Efficiency Properties of Rational Expectations Equilibria with Asymmetric Information
AbstractIn this paper we provide a characterization of the welfare properties of rational expectations equilibria of economies in which, prior to trading, agents have some information over the realization of uncertainty. We study a model with asymmetrically informed agents, treating symmetric information as a limiting case. Trade takes place in asset markets that may or may not be complete. We show that equilibria are characterized by two forms of inefficiency, price inefficiency and spanning inefficiency, and that generically both of them are present. Price inefficiency arises whenever equilibrium prices reveal some information. It formalizes and generalizes the so-called Hirshleifer effect, by showing that generically an interim Pareto improvement is possible even conditional on the information that is available to agents in equilibrium; the primary source of the inefficiency is a pecuniary externality. Spanning inefficiency, on the other hand, arises if prices are not fully revealing and markets are incomplete relative to the uncertainty faced by agents in equilibrium. In this case, an ex-post improvement can generically be implemented by providing agents with more information, thus expanding their risk-sharing opportunities and reducing informational asymmetries, even though this additional information restricts the set of allocations that are incentive compatible and individually rational.
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Bibliographic InfoPaper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 2922.
Date of creation: Aug 2001
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Other versions of this item:
- Rohit Rahi & Piero Gottardi, 2001. "Efficiency Properties of Rational Expectations Equilibria with Asymmetric Information," FMG Discussion Papers dp381, Financial Markets Group.
- Rohit Rahi, 2000. "Efficiency Properties of Rational Expectations Equilibria with Asymmetric Information," Econometric Society World Congress 2000 Contributed Papers 1468, Econometric Society.
- D52 - Microeconomics - - General Equilibrium and Disequilibrium - - - Incomplete Markets
- D60 - Microeconomics - - Welfare Economics - - - General
- D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
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