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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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    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, 1988. "Horizontal Mergers: An Equilibrium Analysis," Department of Economics, Working Paper Series qt0tp305nx, Department of Economics, Institute for Business and Economic Research, UC Berkeley.
    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. Farrell, Joseph & Shapiro, Carl, 1990. "Horizontal Mergers: An Equilibrium Analysis," American Economic Review, American Economic Association, vol. 80(1), pages 107-126, March.
    5. 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, President and Fellows of Harvard College, vol. 98(2), pages 185-199.
    6. Morton I. Kamien & Israel Zang, 1990. "The Limits of Monopolization Through Acquisition," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 105(2), pages 465-499.
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