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Aggregation and design of information in asset markets with adverse selection

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Abstract

How effectively does a decentralized marketplace aggregate information that is dispersed throughout the economy? We study this question in a dynamic setting where sellers have private information that is correlated with an unobservable aggregate state. In any equilibrium, each seller’s trading behavior provides an informative and conditionally independent signal about the aggregate state. We ask whether the state is revealed as the number of informed traders grows large. Surprisingly, the answer is no; we provide conditions under which information aggregation necessarily fails. In another region of the parameter space, aggregating and non-aggregating equilibria coexist. We solve for the optimal information policy of a constrained social planner who observes trading behavior and chooses what information to reveal. We show that non-aggregating equilibria are always constrained inefficient. The optimal information policy Pareto improves upon laissez-faire outcomes by concealing favorable information in order to accelerate trade.

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  • Vladimir Asriyan & William Fuchs & Brett Green, 2017. "Aggregation and design of information in asset markets with adverse selection," Economics Working Papers 1573, Department of Economics and Business, Universitat Pompeu Fabra, revised Feb 2019.
  • Handle: RePEc:upf:upfgen:1573
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    More about this item

    Keywords

    Information aggregation; adverse selection; information design; benchmarks.;
    All these keywords.

    JEL classification:

    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading
    • G18 - Financial Economics - - General Financial Markets - - - Government Policy and Regulation
    • D47 - Microeconomics - - Market Structure, Pricing, and Design - - - Market Design
    • D53 - Microeconomics - - General Equilibrium and Disequilibrium - - - Financial Markets
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness

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