General Equilibrium with Asymmetric Information: a Dual Approach
We study markets where the characteristics or decisions of certain agents are relevant but not known to their trading partners. Assuming exclusive transactions, the environment is described as a continuum economy with indivisible commodities. We characterize incentive efficient allocations as solutions to linear programming problems and appeal to duality theory to demonstrate the generic existence of external effects in these markets. Because under certain conditions such effects may generate non-convexities, randomization emerges as a theoretic possibility. In characterizing market equilibria we show that, consistently with the personalized nature of transactions, prices are generally non-linear in the underlying consumption. On the other hand, external effects may have critical implications for market efficiency. With adverse selection, in fact, cross-subsidization across agents with different private information may be necessary for optimality, and so, the market need not even achieve an incentive efficient allocation. In contrast, for the case of a single commodity, we find that when informational asymmetries arise after the trading period (e.g. moral hazard; ex post hidden types) external effects are fully internalized at a market equilibrium.
|Date of creation:||02 Apr 2000|
|Date of revision:|
|Contact details of provider:|| Postal: 08193, Bellaterra, Barcelona|
Phone: 34 93 592 1203
Fax: +34 93 542-1223
Web page: http://pareto.uab.cat
More information through EDIRC
References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Douglas Gale, 1994.
"Equilibria and Pareto Optima of Markets with Adverse Selection,"
0046, Boston University - Industry Studies Programme.
- Gale, Douglas, 1996. "Equilibria and Pareto Optima of Markets with Adverse Selection," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 7(2), pages 207-35, February.
- Douglas Gale, 1996. "Equilibria and Pareto optima of markets with adverse selection (*)," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 7(2), pages 207-235.
- Sun, Yeneng, 1998. "A theory of hyperfinite processes: the complete removal of individual uncertainty via exact LLN1," Journal of Mathematical Economics, Elsevier, vol. 29(4), pages 419-503, May.
- Richard Arnott & Bruce Greenwald & Joseph E. Stiglitz, 1993.
"Information and Economic Efficiency,"
NBER Working Papers
4533, National Bureau of Economic Research, Inc.
- Alejandro M. Manelli & Daniel R. Vincent, 1992.
"Optimal Procurement Mechanisms,"
999, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
- Prescott, Edward C & Townsend, Robert M, 1984.
"General Competitive Analysis in an Economy with Private Information,"
International Economic Review,
Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 25(1), pages 1-20, February.
- Edward C Prescott & Robert M Townsend, 1997. "General Competitive Analysis in an Economy with Private Information," Levine's Working Paper Archive 1578, David K. Levine.
- Bisin, Alberto & Gottardi, Piero, 1999.
"Competitive Equilibria with Asymmetric Information,"
Journal of Economic Theory,
Elsevier, vol. 87(1), pages 1-48, July.
- Alberto Bisin & Piero Gottardi, 1998. "Competitive Equilibria with Asymmetric Information," Levine's Working Paper Archive 2062, David K. Levine.
- Michael Spence, 1973. "Job Market Signaling," The Quarterly Journal of Economics, Oxford University Press, vol. 87(3), pages 355-374.
- Richard Arnott & Joseph E. Stiglitz, 1988.
"Randomization with Asymmetric Information,"
RAND Journal of Economics,
The RAND Corporation, vol. 19(3), pages 344-362, Autumn.
- Richard J. Arnott & Joseph E. Stiglitz, 1988. "Randomization with Asymmetric Information," NBER Working Papers 2507, National Bureau of Economic Research, Inc.
- Richard Arnott & Joseph E Stiglitz, 2010. "Randomization with Asymmetric Information," Levine's Working Paper Archive 2054, David K. Levine.
- Bruce C. Greenwald & Joseph E. Stiglitz, 1986. "Externalities in Economies with Imperfect Information and Incomplete Markets," The Quarterly Journal of Economics, Oxford University Press, vol. 101(2), pages 229-264.
- Karl Shell & Randall Wright, 2010.
"Indivisibilities, Lotteries and Sunspot Equilibria,"
Levine's Working Paper Archive
2061, David K. Levine.
- Shell, Karl & Wright, Randall, 1993. "Indivisibilities, Lotteries, and Sunspot Equilibria," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 3(1), pages 1-17, January.
- Karl Shell & Randall Wright, 1991. "Indivisibilities, lotteries, and sunspot equilibria," Staff Report 133, Federal Reserve Bank of Minneapolis.
- Makowski, Louis, 1979. "Value theory with personalized trading," Journal of Economic Theory, Elsevier, vol. 20(2), pages 194-212, April.
- Edward C Prescott & Robert M Townsend, 2010.
"Pareto Optima and Competitive Equilibria With Adverse Selection and Moral Hazard,"
Levine's Working Paper Archive
2069, David K. Levine.
- Prescott, Edward C & Townsend, Robert M, 1984. "Pareto Optima and Competitive Equilibria with Adverse Selection and Moral Hazard," Econometrica, Econometric Society, vol. 52(1), pages 21-45, January.
- Wilson, Charles, 1977. "A model of insurance markets with incomplete information," Journal of Economic Theory, Elsevier, vol. 16(2), pages 167-207, December.
- Michael Magill, 2000. "Equity, Options and Efficiency in the Presence of Moral Hazard," Econometric Society World Congress 2000 Contributed Papers 1845, Econometric Society.
- A. Charnes & W. W. Cooper & K. Kortanek, 1965. "On Representations of Semi-Infinite Programs which Have No Duality Gaps," Management Science, INFORMS, vol. 12(1), pages 113-121, September.
- Garratt, Rod & Keister, Todd & Qin, Cheng-Zhong & Shell, Karl, 2002. "Equilibrium Prices When the Sunspot Variable Is Continuous," Journal of Economic Theory, Elsevier, vol. 107(1), pages 11-38, November.
- Mas-Colell, Andreu, 1975. "A model of equilibrium with differentiated commodities," Journal of Mathematical Economics, Elsevier, vol. 2(2), pages 263-295.
- 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.
When requesting a correction, please mention this item's handle: RePEc:aub:autbar:510.02. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Xavier Vila)
If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.
If references are entirely missing, you can add them using this form.
If the full references list an item that is present in RePEc, but the system did not link to it, you can help with this form.
If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your profile, as there may be some citations waiting for confirmation.
Please note that corrections may take a couple of weeks to filter through the various RePEc services.