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Adverse selection, credit and efficiency: The case of the missing market

We analyze a standard environment of adverse selection in credit markets. In our environment, entrepreneurs who are privately informed about the quality of their projects need to borrow in order to invest. Conventional wisdom says that, in this class of economies, the competitive equilibrium is typically inefficient. We show that this conventional wisdom rests on one implicit assumption: entrepreneurs can only access monitored lending. If a new set of markets is added to provide entrepreneurs with additional funds, efficiency can be attained in equilibrium. An important characteristic of these additional markets is that lending in them must be unmonitored, in the sense that it does not condition total borrowing or investment by entrepreneurs. This makes it possible to attain efficiency by pooling all entrepreneurs in the new markets while separating them in the markets for monitored loans.

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File URL: http://www.econ.upf.edu/docs/papers/downloads/1257.pdf
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Paper provided by Department of Economics and Business, Universitat Pompeu Fabra in its series Economics Working Papers with number 1257.

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Date of creation: Dec 2010
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Handle: RePEc:upf:upfgen:1257
Contact details of provider: Web page: http://www.econ.upf.edu/

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  1. Gale, Douglas, 1992. "A Walrasian Theory of Markets with Adverse Selection," Review of Economic Studies, Wiley Blackwell, vol. 59(2), pages 229-55, April.
  2. Alberto Martin, 2003. "On Rothschild-Stiglitz as competitive pooling," Economics Working Papers 917, Department of Economics and Business, Universitat Pompeu Fabra, revised Jan 2006.
  3. Pradeep Dubey & John Geanakoplos, 2001. "Competitive Pooling: Rothschild-Stiglitz Reconsidered," Cowles Foundation Discussion Papers 1346, Cowles Foundation for Research in Economics, Yale University.
  4. Besanko, David & Thakor, Anjan V., 1987. "Competitive equilibrium in the credit market under asymmetric information," Journal of Economic Theory, Elsevier, vol. 42(1), pages 167-182, June.
  5. Boyd, John H & Smith, Bruce D, 1993. "The Equilibrium Allocation of Investment Capital in the Presence of Adverse Selection and Costly State Verification," Economic Theory, Springer, vol. 3(3), pages 427-51, July.
  6. Bisin, Alberto & Rampini, Adriano A., 2006. "Markets as beneficial constraints on the government," Journal of Public Economics, Elsevier, vol. 90(4-5), pages 601-629, May.
  7. Hellwig, Martin, 1987. "Some recent developments in the theory of competition in markets with adverse selection ," European Economic Review, Elsevier, vol. 31(1-2), pages 319-325.
  8. Martin, Alberto, 2009. "A model of collateral, investment, and adverse selection," Journal of Economic Theory, Elsevier, vol. 144(4), pages 1572-1588, July.
  9. Robert Shimer & Randall Wright & Veronica Guerrieri, 2009. "Adverse Selection in Competitive Search Equilibrium," 2009 Meeting Papers 139, Society for Economic Dynamics.
  10. Stiglitz, Joseph E & Weiss, Andrew, 1981. "Credit Rationing in Markets with Imperfect Information," American Economic Review, American Economic Association, vol. 71(3), pages 393-410, June.
  11. Alberto Bisin & Piero Gottardi, 2005. "Efficient Competitive Equilibria with Adverse Selection," CESifo Working Paper Series 1504, CESifo Group Munich.
  12. Bester, Helmut, 1985. "Screening vs. Rationing in Credit Markets with Imperfect Information," American Economic Review, American Economic Association, vol. 75(4), pages 850-55, September.
  13. Rothschild, Michael & Stiglitz, Joseph E, 1976. "Equilibrium in Competitive Insurance Markets: An Essay on the Economics of Imperfect Information," The Quarterly Journal of Economics, MIT Press, vol. 90(4), pages 630-49, November.
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