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Cournot Oligopoly Conditions under which Any Horizontal Merger Is Profitable

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  • David Hennessy

Abstract

Findings in economic theory suggest that horizontal mergers involving firms with aggregate market share less than 50% are unlikely to be motivated by the consequent reduction in competitivity. The results arise because, absent cost efficiencies, quantity-setting firms in small mergers are impoverished by the merger. We demonstrate that this conclusion is a consequence of the strong restrictions imposed on the demand function, and we identify a well-behaved demand function such that any set of merging firms benefits from the reduction in competition even when there are no cost efficiencies.
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Suggested Citation

  • David Hennessy, 2000. "Cournot Oligopoly Conditions under which Any Horizontal Merger Is Profitable," Review of Industrial Organization, Springer;The Industrial Organization Society, vol. 17(3), pages 277-284, November.
  • Handle: RePEc:kap:revind:v:17:y:2000:i:3:p:277-284
    DOI: 10.1023/A:1007804129800
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    References listed on IDEAS

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    1. Cheung, Francis K., 1992. "Two remarks on the equilibrium analysis of horizontal merger," Economics Letters, Elsevier, vol. 40(1), pages 119-123, September.
    2. Farrell, Joseph & Shapiro, Carl, 1990. "Horizontal Mergers: An Equilibrium Analysis," American Economic Review, American Economic Association, vol. 80(1), pages 107-126, March.
    3. Kamien, Morton I. & Zang, Israel, 1991. "Competitively cost advantageous mergers and monopolization," Games and Economic Behavior, Elsevier, vol. 3(3), pages 323-338, August.
    4. Stephen W. Salant & Sheldon Switzer & Robert J. Reynolds, 1983. "Losses From Horizontal Merger: The Effects of an Exogenous Change in Industry Structure on Cournot-Nash Equilibrium," The Quarterly Journal of Economics, Oxford University Press, vol. 98(2), pages 185-199.
    5. Morton I. Kamien & Israel Zang, 1990. "The Limits of Monopolization Through Acquisition," The Quarterly Journal of Economics, Oxford University Press, vol. 105(2), pages 465-499.
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    Citations

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    Cited by:

    1. Tina Kao & Flavio Menezes, 2010. "Welfare-Enhancing Mergers Under Product Differentiation," Manchester School, University of Manchester, vol. 78(4), pages 290-301, July.
    2. Onur A. Koska, 2016. "A Consumer-Surplus Standard in Merger Approvals, Foreign Direct Investment, and Welfare," ERC Working Papers 1612, ERC - Economic Research Center, Middle East Technical University, revised Oct 2016.
    3. Koska, Onur A., 2014. "A Model of Competition between Multinationals," MPRA Paper 68024, University Library of Munich, Germany.
    4. Onur A. Koska & Frank Stähler, 2014. "Optimal Acquisition Strategies in Unknown Territories," Journal of Institutional and Theoretical Economics (JITE), Mohr Siebeck, Tübingen, vol. 170(3), pages 406-426, September.
    5. Gamal Atallah, 2015. "Multi-Firm Mergers with Leaders and Followers," Working Papers E1501E, University of Ottawa, Department of Economics.
    6. Onur A. Koska & Ilke Onur & Frank Stähler, 2015. "The Scope of Auctions in the Presence of Downstream Interactions and Information Externalities," CESifo Working Paper Series 5256, CESifo Group Munich.
    7. Le Pape, Nicolas & Zhao, Kai, 2014. "Horizontal mergers and uncertainty," Economics - The Open-Access, Open-Assessment E-Journal, Kiel Institute for the World Economy (IfW), vol. 8, pages 1-31.
    8. Tsygankova, Marina, 2010. "When is a break-up of Gazprom good for Russia?," Energy Economics, Elsevier, vol. 32(4), pages 908-917, July.
    9. Jacek Prokop, 2009. "Monopolisation of triopoly – revisited," International Journal of Computational Economics and Econometrics, Inderscience Enterprises Ltd, vol. 1(2), pages 113-125.
    10. R. Cellini & L. Lambertini, 2003. "Capital Accumulation and Horizontal Mergers in Differential Oligopoly Games," Working Papers 477, Dipartimento Scienze Economiche, Universita' di Bologna.
    11. D. Dragone & L. Lambertini & A. Mantovani, 2006. "Horizontal Mergers with Scale Economies," Working Papers 571, Dipartimento Scienze Economiche, Universita' di Bologna.
    12. Oliver Budzinski & Jürgen-Peter Kretschmer, 2007. "Implications of Unprofitable Horizontal Mergers: A Re-Interpretation of the Farrell-Shapiro-Framework," Marburg Working Papers on Economics 200714, Philipps-Universität Marburg, Faculty of Business Administration and Economics, Department of Economics (Volkswirtschaftliche Abteilung).
    13. Zhou, Wen, 2008. "Endogenous horizontal mergers under cost uncertainty," International Journal of Industrial Organization, Elsevier, vol. 26(4), pages 903-912, July.
    14. Marina Tsygankova, 2007. "When is Mighty Gazprom Good for Russia?," Discussion Papers 526, Statistics Norway, Research Department.
    15. Oliver Budzinski & Jürgen-Peter Kretschmer, 2009. "Implications of Unprofitable Horizontal Mergers: A Positive External Effect does not Suffice to Clear a Merger!," Working Papers 84/09, University of Southern Denmark, Department of Sociology, Environmental and Business Economics.
    16. Budzinski, Oliver & Kretschmer, Jürgen-Peter, 2015. "Unprofitable horizontal mergers, external effects, and welfare," Ilmenau Economics Discussion Papers 96, Ilmenau University of Technology, Institute of Economics.
    17. D. Dragone & L. Lambertini & A. Mantovani, 2007. "Antitrust Guidelines: A Simple Operational Method for Evaluating Horizontal Mergers," Working Papers 591, Dipartimento Scienze Economiche, Universita' di Bologna.
    18. John S. Heywood & Matthew Mcginty, 2007. "Convex Costs And The Merger Paradox Revisited," Economic Inquiry, Western Economic Association International, vol. 45(2), pages 342-349, April.

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