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Collusion at the extensive margin

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  • Byford, Martin C.
  • Gans, Joshua S.

Abstract

We augment the multi-market collusion model of Bernheim and Whinston (1990) by allowing for firm entry into, and exit from, individual markets. We show that this gives rise to a new mechanism by which a cartel can sustain a collusive agreement: Collusion at the extensive margin whereby firms collude by avoiding entry into each other's markets or territories. We characterise parameter values that sustain this type of collusion and identify the assumptions where this collusion is more likely to hold than its intensive margin counterpart. Specifically, it is demonstrated that where duopoly competition is fierce collusion at the extensive margin is always sustainable. Finally, we provide a theoretic foundation for the use of a “proportional response” enforcement mechanism.

Suggested Citation

  • Byford, Martin C. & Gans, Joshua S., 2014. "Collusion at the extensive margin," International Journal of Industrial Organization, Elsevier, vol. 37(C), pages 75-83.
    • Handle: RePEc:eee:indorg:v:37:y:2014:i:c:p:75-83
    DOI: 10.1016/j.ijindorg.2014.08.001
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    5. John Gross & William L. Holahan, 2003. "Credible Collusion in Spatially Separated Markets," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 44(1), pages 299-312, February.
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    Cited by:

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    2. Andreas Freitag & Catherine Roux & Christian Thöni, 2021. "Communication And Market Sharing: An Experiment On The Exchange Of Soft And Hard Information," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 62(1), pages 175-198, February.
    3. Iossa, Elisabetta & Loertscher, Simon & Marx, Leslie & Rey, Patrick, 2020. "Collusive Market Allocations," CEPR Discussion Papers 14563, C.E.P.R. Discussion Papers.
    4. Roux, Catherine & Santos-Pinto, Luís & Thöni, Christian, 2016. "Home bias in multimarket Cournot games," European Economic Review, Elsevier, vol. 89(C), pages 361-371.
    5. Bhattacharjea, Aditya & Sinha, Uday Bhanu, 2015. "Multi-market collusion with territorial allocation," International Journal of Industrial Organization, Elsevier, vol. 41(C), pages 42-50.
    6. Jay Pil Choi & Seung-Hyun Hong & Seonghoon Jeon, 2013. "Local Identity and Persistent Leadership in Market Share Dynamics: Evidence from Deregulation in the Korean Soju Industry," Korean Economic Review, Korean Economic Association, vol. 29, pages 267-304.

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    More about this item

    Keywords

    Collusion; Credible threats; Proportional response; Multi-market contact;
    All these keywords.

    JEL classification:

    • C73 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Stochastic and Dynamic Games; Evolutionary Games
    • L41 - Industrial Organization - - Antitrust Issues and Policies - - - Monopolization; Horizontal Anticompetitive Practices

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