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

  • Andreea Cosnita-Langlais
  • Jean-Philippe Tropeano

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.

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File URL: http://economix.fr/pdf/dt/2013/WP_EcoX_2013-22.pdf
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Paper provided by University of Paris West - Nanterre la Défense, EconomiX in its series EconomiX Working Papers with number 2013-22.

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Length: 26 pages
Date of creation: 2013
Date of revision:
Handle: RePEc:drm:wpaper:2013-22
Contact details of provider: Postal: 200 Avenue de la République, Bât. G - 92001 Nanterre Cedex
Web page: http://economix.fr
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  1. Heidhues, Paul & Lagerlöf, Johan N. M., 2003. "On the Desirability of an Efficiency Defense in Merger Control," CEPR Discussion Papers 3841, C.E.P.R. Discussion Papers.
  2. Chongwoo Choe & Chander Shekhar, 2008. "Compulsory Or Voluntary Pre-Merger Notification? Theory And Some Evidence," Monash Economics Working Papers 20/08, Monash University, Department of Economics.
  3. Frederic Loss & Estelle Malavolti-Grimal & Thibaud Vergé & Fabian Berges, 2008. "European competition policy modernization: from notification to legal exception," Working Papers 22644, Institut National de la Recherche Agronomique, France.
  4. 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.
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