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Quantifying the Scope for Efficiency Defense in Merger Control: The Werden-Froeb-Index

  • Goppelsroeder, M.

    (Graduate Institute of International Studies, Geneva)

  • Schinkel, M.P.

    ()

    (Universiteit van Amsterdam)

  • Tuinstra, J.

    (Universiteit van Amsterdam)

In both US and EU merger control, merger-specific efficiencies are recognized as a possible defense for horizontal mergers that raise competition concerns. We introduce the Werden-Froeb-index (WFI) to assist in evaluating these efficiencies. The index measures the average reduction in marginal costs required to restore pre-merger equilibrium prices and quantities after the merger is consummated. It has low information requirements and can deal with any number of firms in price- or quantity-competition merging fully or partially, and a large class of demand and cost functions. We show how the WFI complements Phase I merger inquiries as a screening mechanism.

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Paper provided by Universiteit van Amsterdam, Center for Nonlinear Dynamics in Economics and Finance in its series CeNDEF Working Papers with number 06-09.

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Date of creation: 2006
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Handle: RePEc:ams:ndfwpp:06-09
Contact details of provider: Postal: Dept. of Economics and Econometrics, Universiteit van Amsterdam, Roetersstraat 11, NL - 1018 WB Amsterdam, The Netherlands
Phone: + 31 20 525 52 58
Fax: + 31 20 525 52 83
Web page: http://www.fee.uva.nl/cendef/
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  1. Farrell, Joseph & Shapiro, Carl, 2000. "Scale Economies and Synergies in Horizontal Merger Analysis," Competition Policy Center, Working Paper Series qt8v1500b8, Competition Policy Center, Institute for Business and Economic Research, UC Berkeley.
  2. Epstein, Roy J. & Rubinfeld, Daniel, 2001. "Merger Simulation: A Simplified Approach with New Applications," Department of Economics, Working Paper Series qt1c65s24r, Department of Economics, Institute for Business and Economic Research, UC Berkeley.
  3. Johan Lagerlöf & Paul Heidhues, 2002. "On the Desirability of an Efficiency Defense in Merger Control," CIG Working Papers FS IV 02-08, Wissenschaftszentrum Berlin (WZB), Research Unit: Competition and Innovation (CIG).
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  5. Rubinfeld, Daniel L. & Epstein, Roy J., 2001. "Merger Simulation: A Simplified Approach with New Applications," Competition Policy Center, Working Paper Series qt2sq9s8c8, Competition Policy Center, Institute for Business and Economic Research, UC Berkeley.
  6. Fabrizi, Simona & Lippert, Steffen, 2004. "How much efficiency gains and price reductions for an efficiency defense? 'Quanto Basta'," DFAEII Working Papers 2004-04, University of the Basque Country - Department of Foundations of Economic Analysis II.
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  10. Froeb, L.M. & Werden, G.J., 1997. "A Robust test for Consumer Welfare Enhancing Mergers Among Sellers of a Homogeneous Product," Papers 97-1, U.S. Department of Justice - Antitrust Division.
  11. Epstein, Roy J. & Rubinfeld, Daniel, 2012. "Merger Simulation: A Simplified Approach with New Applications," Department of Economics, Working Paper Series qt2k9116ph, Department of Economics, Institute for Business and Economic Research, UC Berkeley.
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