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Concentration Screens for Horizontal Mergers

Author

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  • Nocke, Volker
  • Whinston, Michael D.
Abstract
Concentration-based screens for horizontal mergers, such as those employed in the US DOJ and FTC Horizontal Merger Guidelines, play a central role in merger analysis. However, the basis for these screens, in both form and level, remains unclear. We show that there is both a theoretical and an empirical basis for focusing solely on the change in the Herfindahl index, and ignoring its level, in screening mergers for whether their unilateral effects will harm consumers. We also argue, again both theoretically and empirically, that the levels at which the presumptions currently are set may be too lax, especially with regards to safe harbors.

Suggested Citation

  • Nocke, Volker & Whinston, Michael D., 2020. "Concentration Screens for Horizontal Mergers," CEPR Discussion Papers 14979, C.E.P.R. Discussion Papers.
    • Handle: RePEc:cpr:ceprdp:14979
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    1. Farrell Joseph & Shapiro Carl, 2010. "Antitrust Evaluation of Horizontal Mergers: An Economic Alternative to Market Definition," The B.E. Journal of Theoretical Economics, De Gruyter, vol. 10(1), pages 1-41, March.
    2. Nocke, Volker & Schutz, Nicolas, 2018. "An Aggregative Games Approach to Merger Analysis in Multiproduct-Firm Oligopoly," CEPR Discussion Papers 12905, C.E.P.R. Discussion Papers.
    3. Werden, Gregory J, 1996. "A Robust Test for Consumer Welfare Enhancing Mergers among Sellers of Differentiated Products," Journal of Industrial Economics, Wiley Blackwell, vol. 44(4), pages 409-413, December.
    4. Froeb, Luke M. & Werden, Gregory J., 1998. "A robust test for consumer welfare enhancing mergers among sellers of a homogeneous product," Economics Letters, Elsevier, vol. 58(3), pages 367-369, March.
    5. Schmalensee, Richard, 1987. "Horizontal Merger Policy: Problems and Changes," Journal of Economic Perspectives, American Economic Association, vol. 1(2), pages 41-54, Fall.
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    Cited by:

    1. Tommaso Valletti & Hans Zenger, 2021. "Mergers with Differentiated Products: Where Do We Stand?," Review of Industrial Organization, Springer;The Industrial Organization Society, vol. 58(1), pages 179-212, February.
    2. Janina Kotlinska & Joanna Nucinska & Jacek Bednarz, 2021. "Education Financing: Explaining the Expenditure Concentration Gap between the State and Local Governments in Poland 2008-2019," European Research Studies Journal, European Research Studies Journal, vol. 0(2), pages 564-578.
    3. Gugler, Klaus & Szücs, Florian, 2023. "Market Power and Regulation in Pharmaceutical Markets," Department of Economics Working Paper Series 343, WU Vienna University of Economics and Business.
    4. Craig T. Peters & Jeffrey M. Wilder, 2021. "Ten Years of the 2010 HMG: A Perspective from the Department of Justice," Review of Industrial Organization, Springer;The Industrial Organization Society, vol. 58(1), pages 13-31, February.
    5. Steven C. Salop & Fiona Scott Morton, 2021. "The 2010 HMGs Ten Years Later: Where Do We Go From Here?," Review of Industrial Organization, Springer;The Industrial Organization Society, vol. 58(1), pages 81-101, February.
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    7. Nathan H. Miller & Gloria Sheu, 2021. "Quantitative Methods for Evaluating the Unilateral Effects of Mergers," Review of Industrial Organization, Springer;The Industrial Organization Society, vol. 58(1), pages 143-177, February.
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    11. Yossi Spiegel, 2021. "The Herfindahl‐Hirschman Index and the Distribution of Social Surplus," Journal of Industrial Economics, Wiley Blackwell, vol. 69(3), pages 561-594, September.

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    More about this item

    Keywords

    Horizontal merger; Oligopoly; Herfindahl index; Market concentration; market power;
    All these keywords.

    JEL classification:

    • L40 - Industrial Organization - - Antitrust Issues and Policies - - - General
    • L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets
    • D43 - Microeconomics - - Market Structure, Pricing, and Design - - - Oligopoly and Other Forms of Market Imperfection

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