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Ex post or ex ante? On the optimal timing of merger control

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  • Andreea Cosnita-Langlais
  • Jean-Philippe Tropeano

Abstract

We study the optimal timing of merger control by comparing the pre-and post closing enforcement. Mergers have both pro- and anticompetitive effects, and the parties(the agency and the merging firms) veri able information on them is endogenous: it depends on the timing of the merger control, as well as on some investment in evidence production. The ex post enforcement turns out optimal whenever the costs of providing veri able information on both efficiency gains and market power are sufficiently low, regardless of whether the fi rms know ex ante or not their true merger type.

Suggested Citation

  • Andreea Cosnita-Langlais & Jean-Philippe Tropeano, 2013. "Ex post or ex ante? On the optimal timing of merger control," EconomiX Working Papers 2013-22, University of Paris Nanterre, EconomiX.
  • Handle: RePEc:drm:wpaper:2013-22
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    References listed on IDEAS

    as
    1. Lagerlof, Johan N.M. & Heidhues, Paul, 2005. "On the desirability of an efficiency defense in merger control," International Journal of Industrial Organization, Elsevier, vol. 23(9-10), pages 803-827, December.
    2. Loss, Frederic & Malavolti-Grimal, Estelle & Verge, Thibaud & Berges-Sennou, Fabian, 2008. "European competition policy modernization: From notifications to legal exception," European Economic Review, Elsevier, vol. 52(1), pages 77-98, January.
    3. Ottaviani, Marco & Wickelgren, Abraham L., 2011. "Ex ante or ex post competition policy? A progress report," International Journal of Industrial Organization, Elsevier, vol. 29(3), pages 356-359, May.
    4. Choe, Chongwoo & Shekhar, Chander, 2010. "Compulsory or voluntary pre-merger notification? Theory and some evidence," International Journal of Industrial Organization, Elsevier, vol. 28(1), pages 10-20, January.
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    More about this item

    Keywords

    merger control; competition policy; evidence production;

    JEL classification:

    • L41 - Industrial Organization - - Antitrust Issues and Policies - - - Monopolization; Horizontal Anticompetitive Practices
    • K21 - Law and Economics - - Regulation and Business Law - - - Antitrust Law
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design

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