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Collusion dans les enchères: quelques apports de jeux coopératifs


  • Francoise Forges

    () (CEREMADE - CEntre de REcherches en MAthématiques de la DEcision - Université Paris-Dauphine - CNRS - Centre National de la Recherche Scientifique)

  • Riham Barbar


We consider the second price sealed bid auction of an object that the potential buyers value privately and independently. We show that a cartel’s ex ante optimum, subject to incentive compatility and ex post balanced transfers, coincides with the first best and defines a supermodular characteristic function. By using two standard solution concepts, the core and the Shapley value, we show, among other properties, that every cartel is stable and that bidders gain in forming cartels whose size is as large as possible. We illustrate the difficulties to extend our results in the context of common values. Classification JEL : C71, D44.
(This abstract was borrowed from another version of this item.)

Suggested Citation

  • Francoise Forges & Riham Barbar, 2007. "Collusion dans les enchères: quelques apports de jeux coopératifs," Post-Print hal-00360742, HAL.
  • Handle: RePEc:hal:journl:hal-00360742
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    References listed on IDEAS

    1. Robert J. Aumann, 1995. "Repeated Games with Incomplete Information," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262011476, January.
    2. Daniel J. Seidmann & Eyal Winter, 1997. "Strategic Information Transmission with Verifiable Messages," Econometrica, Econometric Society, vol. 65(1), pages 163-170, January.
    3. Watson, Joel, 1996. "Information Transmission When the Informed Party Is Confused," Games and Economic Behavior, Elsevier, vol. 12(1), pages 143-161, January.
    4. Blume Andreas, 1994. "Equilibrium Refinements in Sender-Receiver Games," Journal of Economic Theory, Elsevier, vol. 64(1), pages 66-77, October.
    5. Jérôme Renault, 2001. "3-player repeated games with lack of information on one side," International Journal of Game Theory, Springer;Game Theory Society, vol. 30(2), pages 221-245.
    6. repec:dau:papers:123456789/6109 is not listed on IDEAS
    7. Crawford, Vincent P & Sobel, Joel, 1982. "Strategic Information Transmission," Econometrica, Econometric Society, vol. 50(6), pages 1431-1451, November.
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    Cited by:

    1. Omer Biran, 2011. "Core stable bidding rings in independent private value auctions with externalities," Working Papers halshs-00608008, HAL.
    2. repec:dau:papers:123456789/7891 is not listed on IDEAS
    3. repec:dau:papers:123456789/4100 is not listed on IDEAS
    4. Biran, Omer & Forges, Françoise, 2011. "Core-stable rings in auctions with independent private values," Games and Economic Behavior, Elsevier, vol. 73(1), pages 52-64, September.
    5. Biran, Omer, 2011. "Mécanismes d'échange en présence d'externalités," Economics Thesis from University Paris Dauphine, Paris Dauphine University, number 123456789/7238 edited by Forges, Françoise, April.

    More about this item

    JEL classification:

    • C71 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Cooperative Games
    • D44 - Microeconomics - - Market Structure, Pricing, and Design - - - Auctions


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