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How Demand Information Can Destabilize a Cartel

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Liliane Karlinger ()

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Abstract

This paper studies a symmetric Bertrand duopoly with imperfect mon- itoring where rms receive noisy public signals about the state of demand. These signals have two opposite e ects on the incentive to collude: avoid- ing punishment after a low-demand period increases collusive pro ts, mak- ing collusion more attractive, but it also softens the threat of punishment, which increases the temptation to undercut the rival. There are cases where the latter e ect dominates, and so the collusive equilibrium does not always exist when it does absent demand information. These ndings are related to the Sugar Institute Case studied by Genesove and Mullin (2001).

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Paper provided by University of Vienna, Department of Economics in its series Vienna Economics Papers with number 0803.

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Date of creation: Feb 2008
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Handle: RePEc:vie:viennp:0803

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Find related papers by JEL classification:
L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets
L41 - Industrial Organization - - Antitrust Issues and Policies - - - Monopolization; Horizontal Anticompetitive Practices

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  1. Abreu, Dilip & Pearce, David & Stacchetti, Ennio, 1986. "Optimal cartel equilibria with imperfect monitoring," Journal of Economic Theory, Elsevier, vol. 39(1), pages 251-269, June. [Downloadable!] (restricted)
  2. Natalia Fabra, 2003. "Tacit Collusion in Repeated Auctions: Uniform Versus Discriminatory," Journal of Industrial Economics, Blackwell Publishing, vol. 51(3), pages 271-293, 09. [Downloadable!] (restricted)
  3. David Genesove & Wallace P. Mullin, 2001. "Rules, Communication and Collusion: Narrative Evidence from the Sugar Institute Case," NBER Working Papers 8145, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
    Other versions:
  4. Nilsson, Arvid, 1999. "Transparency and Competition," Working Paper Series in Economics and Finance 298, Stockholm School of Economics, revised 29 Nov 1999. [Downloadable!]
  5. Raith, Michael, 1996. "A General Model of Information Sharing in Oligopoly," Journal of Economic Theory, Elsevier, vol. 71(1), pages 260-288, October. [Downloadable!] (restricted)
    Other versions:
  6. Fuller, Stephen W. & Ruppel, Fred J. & Bessler, David A., 1990. "Effect Of Contract Disclosure On Price: Railroad Grain Contracting In The Plains," Western Journal of Agricultural Economics, Western Agricultural Economics Association, vol. 15(02), December. [Downloadable!]
  7. Green, Edward J & Porter, Robert H, 1984. "Noncooperative Collusion under Imperfect Price Information," Econometrica, Econometric Society, vol. 52(1), pages 87-100, January. [Downloadable!] (restricted)
    Other versions:
  8. Klemperer, Paul D & Meyer, Margaret A, 1989. "Supply Function Equilibria in Oligopoly under Uncertainty," Econometrica, Econometric Society, vol. 57(6), pages 1243-77, November. [Downloadable!] (restricted)
  9. H. Peter Møllgaard & Per Baltzer Overgaard, 1999. "Market Transparency: A Mixed Blessing?," CIE Discussion Papers 1999-15, University of Copenhagen. Department of Economics. Centre for Industrial Economics, revised Feb 2000. [Downloadable!]
  10. Fudenberg, Drew & Levine, David I & Maskin, Eric, 1994. "The Folk Theorem with Imperfect Public Information," Econometrica, Econometric Society, vol. 62(5), pages 997-1039, September. [Downloadable!] (restricted)
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  11. Albaek, Svend & Mollgaard, Peter & Overgaard, Per B, 1997. "Government-Assisted Oligopoly Coordination? A Concrete Case," Journal of Industrial Economics, Blackwell Publishing, vol. 45(4), pages 429-43, December. [Downloadable!] (restricted)
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  12. Michihiro Kandori & Hitoshi Matsushima, 1998. "Private Observation, Communication and Collusion," Econometrica, Econometric Society, vol. 66(3), pages 627-652, May.
  13. Vives, Xavier, 1984. "Duopoly information equilibrium: Cournot and bertrand," Journal of Economic Theory, Elsevier, vol. 34(1), pages 71-94, October. [Downloadable!] (restricted)
  14. Olivier Compte, 1998. "Communication in Repeated Games with Imperfect Private Monitoring," Econometrica, Econometric Society, vol. 66(3), pages 597-626, May.
  15. Cason, Timothy N & Mason, Charles F, 1999. "Information Sharing and Tacit Collusion in Laboratory Duopoly Markets," Economic Inquiry, Oxford University Press, vol. 37(2), pages 258-81, April.
  16. Robert H. Porter, 1983. "A Study of Cartel Stability: The Joint Executive Committee, 1880-1886," Bell Journal of Economics, The RAND Corporation, vol. 14(2), pages 301-314, Autumn. [Downloadable!] (restricted)
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