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Risk-Sharing and Retrading in Incomplete Markets

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  • Piero Gottardi
  • Rohit Rahi

Abstract

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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Bibliographic Info

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

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Date of creation: 2012
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Handle: RePEc:eui:euiwps:eco2012/03

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Keywords: Competitive Equilibrium; Incomplete Markets; Information; Re-trading;

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  1. Piero Gottardi & Rohit Rahi, 2007. "Value of Information in Competitive Economies with Incomplete Markets," Working Papers 2007_25, Department of Economics, University of Venice "Ca' Foscari".
  2. Lawrence Blume & Tarek Coury & David Easley, 2006. "Information, trade and incomplete markets," Economic Theory, Springer, vol. 29(2), pages 379-394, October.
  3. 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.
  4. Michael Magill & Martine Quinzii, 2002. "Theory of Incomplete Markets, Volume 1," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262632543.
  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.
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