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Dynamic Adverse Selection and the Size of the Informed Side of the Market
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Dynamic Adverse Selection and the Size of the Informed Side of the Market

Author

Listed:
  • Ennio Bilancini
  • Leonardo Boncinelli

Abstract

In this paper we examine the problem of dynamic adverse selection in a stylized market where the quality of goods is a seller’s private information. We show that in equilibrium all goods can be traded if a simple piece of information is made publicly available: the size of the informed side of the market. Moreover, we show that if exchanges can take place frequently enough, then agents roughly enjoy the entire potential surplus from exchanges. We illustrate these findings with a dynamic model of trade where buyers and sellers repeatedly interact over time. More precisely we prove that, if the size of the informed side of the market is a public information at each trading stage, then there exists a weak perfect Bayesian equilibrium where all goods are sold in finite time and where the price and quality of traded goods are increasing over time. Moreover, we show that as the time between exchanges becomes arbitrarily small, full trade still obtains in finite time – i.e., all goods are actually traded in equilibrium – while total surplus from exchanges converges to the entire potential. These results suggest two policy interventions in markets suffering from dynamic adverse selection: first, the public disclosure of the size of the informed side of the market in each trading stage and, second, the increase of the frequency of trading stages.

Suggested Citation

  • Ennio Bilancini & Leonardo Boncinelli, 2011. "Dynamic Adverse Selection and the Size of the Informed Side of the Market," Center for Economic Research (RECent) 057, University of Modena and Reggio E., Dept. of Economics "Marco Biagi".
    • Handle: RePEc:mod:recent:057
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    References listed on IDEAS

    as
    1. Michele Bruni & Claudio Tabacchi, 2011. "Present and Future of the Chinese labour Marke," Department of Economics 0649, University of Modena and Reggio E., Faculty of Economics "Marco Biagi".
    2. Johannes Hörner & Nicolas Vieille, 2009. "Public vs. Private Offers in the Market for Lemons," Econometrica, Econometric Society, vol. 77(1), pages 29-69, January.
    3. Marina Murat & Barbara Pistoresi, 2009. "Emigrant and immigrant networks in FDI," Applied Economics Letters, Taylor & Francis Journals, vol. 16(12), pages 1261-1264.
    4. Giuseppe Marotta, 1997. "Does trade credit redistribution thwart monetary policy? Evidence from Italy," Applied Economics, Taylor & Francis Journals, vol. 29(12), pages 1619-1629.
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    Cited by:

    1. Moreno, Diego & Wooders, John, 2016. "Dynamic markets for lemons: performance, liquidity, and policy intervention," Theoretical Economics, Econometric Society, vol. 11(2), May.

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    More about this item

    Keywords

    dynamic adverse selection; full trade; size of the informed side; frequency of exchanges; asymmetric information;
    All these keywords.

    JEL classification:

    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • L15 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Information and Product Quality

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