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Trade through endogenous intermediaries


  • Kilenthong, Weerachart
  • Qin, Cheng-Zhong


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.

Suggested Citation

  • Kilenthong, Weerachart & Qin, Cheng-Zhong, 2010. "Trade through endogenous intermediaries," MPRA Paper 22046, University Library of Munich, Germany.
  • Handle: RePEc:pra:mprapa:22046

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    References listed on IDEAS

    1. Moore, John & Repullo, Rafael, 1988. "Subgame Perfect Implementation," Econometrica, Econometric Society, vol. 56(5), pages 1191-1220, September.
    2. 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.
    3. Baumol, William J, 1982. "Contestable Markets: An Uprising in the Theory of Industry Structure," American Economic Review, American Economic Association, vol. 72(1), pages 1-15, March.
    4. Boyd, John H. & Prescott, Edward C., 1986. "Financial intermediary-coalitions," Journal of Economic Theory, Elsevier, vol. 38(2), pages 211-232, April.
    5. Nicholas Yannelis, 2009. "Debreu’s social equilibrium theorem with asymmetric information and a continuum of agents," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 38(2), pages 419-432, February.
    6. Mas-Colell, Andreu, 1975. "A model of equilibrium with differentiated commodities," Journal of Mathematical Economics, Elsevier, vol. 2(2), pages 263-295.
    7. John H. Boyd & Edward C. Prescott & Bruce D. Smith, 1988. "Organizations in Economic Analysis," Canadian Journal of Economics, Canadian Economics Association, vol. 21(3), pages 477-491, August.
    8. Roberto Serrano & Rajiv Vohra, 1997. "Non-cooperative implementation of the core," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 14(4), pages 513-525.
    9. Starr,Ross M., 2011. "General Equilibrium Theory," Cambridge Books, Cambridge University Press, number 9780521533867, May.
    10. Starr,Ross M., 2011. "General Equilibrium Theory," Cambridge Books, Cambridge University Press, number 9780521826457, May.
    11. 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.
    12. Townsend, Robert M., 1983. "Theories of intermediated structures," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 18(1), pages 221-272, January.
    13. Robert M. Townsend, 1978. "Intermediation with Costly Bilateral Exchange," Review of Economic Studies, Oxford University Press, vol. 45(3), pages 417-425.
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    Cited by:

    1. Weerachart T. Kilenthong & Robert M. Townsend, 2016. "A Market Based Solution for Fire Sales and Other Pecuniary Externalities," NBER Working Papers 22056, National Bureau of Economic Research, Inc.

    More about this item


    intermediation; core; subgame-perfect equilibrium;

    JEL classification:

    • D50 - Microeconomics - - General Equilibrium and Disequilibrium - - - General
    • C71 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Cooperative Games
    • C72 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Noncooperative Games

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