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Value of Information in Competitive Economies with Incomplete Markets

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  • Piero Gottardi
  • Rohit Rahi

Abstract

We study the value of information in a competitive economy in which agents trade in asset markets to reallocate risk. We characterize the kinds of information that allow a welfare improvement when portfolios can be freely reallocated. We then compare competitive equilibria before and after a change in information. We show that generically, if markets are sufficiently incomplete, the welfare effects are completely arbitrary: there typically exist changes in information that make all agents better off, or all agents worse off.

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Bibliographic Info

Paper provided by European University Institute in its series Economics Working Papers with number ECO2010/34.

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Date of creation: 2010
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Handle: RePEc:eui:euiwps:eco2010/34

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Keywords: Equilibrium; Incomplete Markets; Value of Information;

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References

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  1. Cass, David & Shell, Karl, 1983. "Do Sunspots Matter?," Journal of Political Economy, University of Chicago Press, vol. 91(2), pages 193-227, April.
  2. Hakansson, Nils H & Kunkel, J Gregory & Ohlson, James A, 1982. " Sufficient and Necessary Conditions for Information to Have Social Value in Pure Exchange," Journal of Finance, American Finance Association, vol. 37(5), pages 1169-81, December.
  3. Bengt Holmstrom & Roger B. Myerson, 1981. "Efficient and Durable Decision Rules with Incomplete Information," Discussion Papers 495, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  4. Citanna, Alessandro & Villanacci, Antonio, 2000. "Incomplete Markets, Allocative Efficiency, and the Information Revealed by Prices," Journal of Economic Theory, Elsevier, vol. 90(2), pages 222-253, February.
  5. Hirshleifer, Jack, 1971. "The Private and Social Value of Information and the Reward to Inventive Activity," American Economic Review, American Economic Association, vol. 61(4), pages 561-74, September.
  6. Rohit Rahi, 2000. "Efficiency Properties of Rational Expectations Equilibria with Asymmetric Information," Econometric Society World Congress 2000 Contributed Papers 1468, Econometric Society.
  7. Magill, Michael & Shafer, Wayne, 1991. "Incomplete markets," Handbook of Mathematical Economics, in: W. Hildenbrand & H. Sonnenschein (ed.), Handbook of Mathematical Economics, edition 1, volume 4, chapter 30, pages 1523-1614 Elsevier.
  8. Edward E. Schlee, 2001. "The Value of Information in Efficient Risk-Sharing Arrangements," American Economic Review, American Economic Association, vol. 91(3), pages 509-524, June.
  9. Eckwert, Bernhard & Zilcha, Itzhak, 2001. "The Value of Information in Production Economies," Journal of Economic Theory, Elsevier, vol. 100(1), pages 172-186, September.
  10. Colin M. Campbell, 2002. "Blackwell's Ordering and Public Information," Departmental Working Papers 200206, Rutgers University, Department of Economics.
  11. Atsushi Kajii & Antonio Villanacci & Alessandro Citanna, 1998. "Constrained suboptimality in incomplete markets: a general approach and two applications," Economic Theory, Springer, vol. 11(3), pages 495-521.
  12. Greenwald, Bruce C & Stiglitz, Joseph E, 1986. "Externalities in Economies with Imperfect Information and Incomplete Markets," The Quarterly Journal of Economics, MIT Press, vol. 101(2), pages 229-64, May.
  13. Michael Magill & Martine Quinzii, 2002. "Theory of Incomplete Markets, Volume 1," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262632543, December.
  14. Lawrence Blume & Tarek Coury & David Easley, 2006. "Information, trade and incomplete markets," Economic Theory, Springer, vol. 29(2), pages 379-394, October.
  15. Milne, Frank & Shefrin, H. M., 1987. "Information and securities: A note on pareto dominance and the second best," Journal of Economic Theory, Elsevier, vol. 43(2), pages 314-328, December.
  16. Green, Jerry R, 1981. "Value of Information with Sequential Futures Markets," Econometrica, Econometric Society, vol. 49(2), pages 335-58, March.
  17. David Cass & Alessandro Citanna, 1998. "Pareto improving financial innovation in incomplete markets," Economic Theory, Springer, vol. 11(3), pages 467-494.
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Cited by:
  1. Piero Gottardi & Rohit Rahi, 2013. "Risk sharing and retrading in incomplete markets," Economic Theory, Springer, vol. 54(2), pages 287-304, October.

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