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Risk-Sharing and Retrading in Incomplete Markets

  • Piero Gottardi
  • Rohit Rahi

At a competitive equilibrium of an incomplete-markets economy agents’ marginal valuations for the tradable assets are equalized ex-ante. We characterize the finest partition of the state space conditional on which this equality holds for any economy. This leads naturally to a necessary and sufficient condition on information that would lead to retrade, if such information were to become publicly available after the initial round of trade.

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Paper provided by European University Institute in its series Economics Working Papers with number ECO2012/03.

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Date of creation: 2012
Date of revision:
Handle: RePEc:eui:euiwps:eco2012/03
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  1. 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.
  2. John Geanakoplos & Andreu Mas-Colell, 1985. "Real Indeterminacy with Financial Assets," Cowles Foundation Discussion Papers 770R, Cowles Foundation for Research in Economics, Yale University, revised Oct 1985.
  3. Piero Gottardi & Rohit Rahi, 2007. "Value of information in competitive economies with incomplete markets," LSE Research Online Documents on Economics 4749, London School of Economics and Political Science, LSE Library.
  4. Paul Milgrom & Nancy L.Stokey, 1979. "Information, Trade, and Common Knowledge," Discussion Papers 377R, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  5. 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.
  6. Michael Magill & Martine Quinzii, 2002. "Theory of Incomplete Markets, Volume 1," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262632543, June.
  7. Lawrence Blume & Tarek Coury & David Easley, 2006. "Information, trade and incomplete markets," Economic Theory, Springer, vol. 29(2), pages 379-394, October.
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