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Unilateral Effects Screens for Partial Horizontal Acquisitions: The Generalized HHI and GUPPI

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  • Brito, Duarte
  • Osório, António (António Miguel)
  • Ribeiro, Ricardo
  • Vasconcelos, Helder,

Abstract

Recent years have witnessed an increased interest, by competition agencies, in assessing the competitive effects of partial acquisitions. We propose a generalization of the two most traditional indicators used to screen unilateral anti-competitive effects - the Herfindahl-Hirschman Index and the Gross Upward Price Pressure Index - to partial horizontal acquisition settings. The proposed generalized indicators are endogenously derived under a probabilistic voting model in which the manager of each firm is elected in a shareholder assembly between two potential candidates who seek to obtain utility from an exogenous rent associated with corporate office. The model (i) can cope with settings involving all types of owners and rights: owners that can be internal to the industry (rival firms) and external to the industry; and rights that can capture financial and corporate control interests, can be direct and indirect, can be partial or full, (ii ) yields an endogenous measure of the owners ultimate corporate control rights, and (iii ) can also be used - in case the potential acquisition is inferred to likely enhance market power - to devise divestiture structural remedies. We also provide an empirical application of the two proposed generalized indicators to several acquisitions in the wet shaving industry, with the objective of providing practitioners with a step-by-step illustration of how to compute them in antitrust cases. JEL Classification: L13, L41, L66. Keywords: Antitrust, Partial Horizontal Acquisitions, Oligopoly, Screening Indicators, HHI, GUPPI, Corporate Control, Banzhaf Power Index

Suggested Citation

  • Brito, Duarte & Osório, António (António Miguel) & Ribeiro, Ricardo & Vasconcelos, Helder,, 2018. "Unilateral Effects Screens for Partial Horizontal Acquisitions: The Generalized HHI and GUPPI," Working Papers 2072/321560, Universitat Rovira i Virgili, Department of Economics.
  • Handle: RePEc:urv:wpaper:2072/321560
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    Cited by:

    1. Azar, José & Vives, Xavier, 2018. "Oligopoly, Macroeconomic Performance, and Competition Policy," CEPR Discussion Papers 13000, C.E.P.R. Discussion Papers.
    2. Miguel Antón & Florian Ederer & Mireia Giné & Martin Schmalz, 2016. "Common Ownership, Competition, and Top Management Incentives," Cowles Foundation Discussion Papers 2046R, Cowles Foundation for Research in Economics, Yale University, revised Oct 2017.
    3. Duarte Brito & Einer Elhauge & Ricardo Ribeiro & Helder Vasconcelos, 2018. "Modeling Horizontal Shareholding with Ownership Dispersion," Working Papers de Economia (Economics Working Papers) 01, Católica Porto Business School, Universidade Católica Portuguesa.
    4. Brito, Duarte & Ribeiro, Ricardo & Vasconcelos, Helder, 2018. "Quantifying the coordinated effects of partial horizontal acquisitions," European Economic Review, Elsevier, vol. 110(C), pages 108-149.
    5. Azar, José & Vives, Xavier, 2018. "Oligopoly, Macroeconomic Performance, and Competition Policy," CEPR Discussion Papers 13000, C.E.P.R. Discussion Papers.

    More about this item

    Keywords

    Oligopolis; Competència econòmica -- Dret i legislació; 33 - Economia;

    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
    • L66 - Industrial Organization - - Industry Studies: Manufacturing - - - Food; Beverages; Cosmetics; Tobacco

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