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Trade through endogenous intermediaries

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  • Kilenthong, Weerachart
  • Qin, Cheng-Zhong

Abstract

We apply an intermediation game of Townsend (1983) to analyze trade in an exchange economy through endogenous intermediaries. In this game, each trader has the opportunity to become an intermediary by oering to buy or sell unlimited quantities of the commodities at a certain price vector and for a certain group of customers subject to feasibility constraint. An intermediary will not be active unless some of its customers subsequently choose to trade with it. We introduce an "intermediation core" and show that the subgame-perfect equilibrium allocations of the intermediation game are contained in the intermediation core, similar to the inclusion of competitive equilibrium allocations in the core usually studied. We also identify, in terms of the supporting intermediary structures, intermediation core allocations which are also subgame-perfect equilibrium allocations of the intermediation game. These results provide both a characterization and welfare properties of subgame-perfect equilibrium allocations of the intermediation game.

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Bibliographic Info

Paper provided by University Library of Munich, Germany in its series MPRA Paper with number 22046.

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Date of creation: 13 Apr 2010
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Handle: RePEc:pra:mprapa:22046

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Keywords: intermediation; core; subgame-perfect equilibrium;

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  1. John H. Boyd & Edward C. Prescott, 1985. "Financial intermediary-coalitions," Staff Report 87, Federal Reserve Bank of Minneapolis.
  2. John H. Boyd & Edward C. Prescott & Bruce D. Smith, 1988. "Organizations in economic analysis," Working Papers 385, Federal Reserve Bank of Minneapolis.
  3. Roberto Serrano & Rajiv Vohra, 1997. "Non-cooperative implementation of the core," Social Choice and Welfare, Springer, vol. 14(4), pages 513-525.
  4. Qin, Cheng-Zhong & Shapley, Lloyd S. & Shimomura, Ken-Ichi, 2006. "The Walras core of an economy and its limit theorem," Journal of Mathematical Economics, Elsevier, vol. 42(2), pages 180-197, April.
  5. Mas-Colell, Andreu, 1975. "A model of equilibrium with differentiated commodities," Journal of Mathematical Economics, Elsevier, vol. 2(2), pages 263-295.
  6. Abreu, Dilip & Sen, Arunava, 1990. "Subgame perfect implementation: A necessary and almost sufficient condition," Journal of Economic Theory, Elsevier, vol. 50(2), pages 285-299, April.
  7. Townsend, Robert M, 1978. "Intermediation with Costly Bilateral Exchange," Review of Economic Studies, Wiley Blackwell, vol. 45(3), pages 417-25, October.
  8. Nicholas Yannelis, 2009. "Debreu’s social equilibrium theorem with asymmetric information and a continuum of agents," Economic Theory, Springer, vol. 38(2), pages 419-432, February.
  9. Townsend, Robert M., 1983. "Theories of intermediated structures," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 18(1), pages 221-272, January.
  10. Moore, John & Repullo, Rafael, 1988. "Subgame Perfect Implementation," Econometrica, Econometric Society, vol. 56(5), pages 1191-1220, September.
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