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Bayesian Nash Equilibrium in "Linear" Cournot Models with Private Information about Costs

  • Sjaak Hurkens

Calculating explicit closed form solutions of Cournot models where firms have private information about their costs is, in general, very cumbersome. Most authors consider therefore linear demands and constant marginal costs. However, within this framework, the nonnegativity constraint on prices (and quantities) has been ignored or not properly dealt with and the correct calculation of all Bayesian Nash equilibria is more complicated than expected. Moreover, multiple symmetric and interior Bayesian equilibria may exist for an open set of parameters. The reason for this is that linear demand is not really linear, since there is a kink at zero price: the general "linear" inverse demand function is P(Q) = max{a - bQ,0} rather than P(Q) = a - bQ.

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File URL: http://research.barcelonagse.eu/tmp/working_papers/674.pdf
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Paper provided by Barcelona Graduate School of Economics in its series Working Papers with number 674.

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Date of creation: Nov 2012
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Handle: RePEc:bge:wpaper:674
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  1. Vives, Xavier, 1984. "Duopoly information equilibrium: Cournot and bertrand," Journal of Economic Theory, Elsevier, vol. 34(1), pages 71-94, October.
  2. Gal-Or, Esther, 1986. "Information Transmission-Cournot and Bertrand Equilibria," Review of Economic Studies, Wiley Blackwell, vol. 53(1), pages 85-92, January.
  3. Vives, Xavier, 1988. "Aggregation of Information in Large Cournot Markets," Econometrica, Econometric Society, vol. 56(4), pages 851-76, July.
  4. Li, Lode., 1985. "Cournot Oligopoly with Information Sharing," Working Papers 561, California Institute of Technology, Division of the Humanities and Social Sciences.
  5. Cramton, Peter C & Palfrey, Thomas R, 1990. "Cartel Enforcement with Uncertainty about Costs," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 31(1), pages 17-47, February.
  6. Shapiro, Carl, 1986. "Exchange of Cost Information in Oligopoly," Review of Economic Studies, Wiley Blackwell, vol. 53(3), pages 433-46, July.
  7. Esther Hauk & Sjaak Hurkens, 2001. "Secret information acquisition in Cournot markets," Economic Theory, Springer, vol. 18(3), pages 661-681.
  8. Johan Lagerlöf, 2003. "Insisting on a Non-Negative Price: Oligopoly, Uncertainty, Welfare, and Multiple Equilibria," CIG Working Papers SP II 2003-04, Wissenschaftszentrum Berlin (WZB), Research Unit: Competition and Innovation (CIG).
  9. Malueg, David A & Tsutsui, Shunichi O, 1998. "Oligopoly Information Exchange When Non-negative Price and Output Constraints May Bind," Australian Economic Papers, Wiley Blackwell, vol. 37(4), pages 363-71, December.
  10. Sjaak Hurkens & Nir Vulkan, 1996. "Information acquisition and entry," Economics Working Papers 155, Department of Economics and Business, Universitat Pompeu Fabra.
  11. Richard N. Clarke, 1983. "Collusion and the Incentives for Information Sharing," Bell Journal of Economics, The RAND Corporation, vol. 14(2), pages 383-394, Autumn.
  12. Raith, Michael, 1996. "A General Model of Information Sharing in Oligopoly," Journal of Economic Theory, Elsevier, vol. 71(1), pages 260-288, October.
  13. Li, Lode & McKelvey, Richard D. & Page, Talbot, 1987. "Optimal research for cournot oligopolists," Journal of Economic Theory, Elsevier, vol. 42(1), pages 140-166, June.
  14. Hwang Hae-shin, 1993. "Optimal Information Acquisition for Heterogenous Duopoly Firms," Journal of Economic Theory, Elsevier, vol. 59(2), pages 385-402, April.
  15. Alison J. Kirby, 1988. "Trade Associations as Information Exchange Mechanisms," RAND Journal of Economics, The RAND Corporation, vol. 19(1), pages 138-146, Spring.
  16. Xavier Vives, 1990. "Trade Association Disclosure Rules, Incentives to Share Information, and Welfare," RAND Journal of Economics, The RAND Corporation, vol. 21(3), pages 409-430, Autumn.
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