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Industry Concentration and Welfare: On the Use of Stock Market Evidence from Horizontal Mergers

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  • SVEN-OLOF FRIDOLFSSON
  • JOHAN STENNEK

Abstract

There is diverging empirical evidence on the competitive effects of horizontal mergers: consumer prices (and thus presumably competitors' profits) often rise while competitors' share prices fall. Our model of endogenous mergers provides a possible reconciliation. It is demonstrated that anti-competitive mergers may reduce competitors' share prices, if the merger announcement informs the market that the competitors lost a race to buy the target. Also the use of 'first rumour' as an event may create similar problems of interpretation. We also indicate how the event-study methodology may be adapted to identify competitive effects and thus the welfare consequences for consumers. Copyright (c) The London School of Economics and Political Science 2009.

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Bibliographic Info

Article provided by London School of Economics and Political Science in its journal Economica.

Volume (Year): 77 (2010)
Issue (Month): 308 (October)
Pages: 734-750

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Handle: RePEc:bla:econom:v:77:y:2010:i:308:p:734-750

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Cited by:
  1. Tomaso Duso & Klaus Gugler & Florian Szücs, 2013. "An Empirical Assessment of the 2004 EU Merger Policy Reform," Economic Journal, Royal Economic Society, vol. 123(11), pages F596-F619, November.
  2. Patrice Bougette & Florent Venayre, 2008. "Contrôles a priori et a posteriori des concentrations : comment augmenter l'efficacité des politiques de concurrence ?," Post-Print halshs-00463953, HAL.
  3. Oliver Budzinski, 2011. "Impact Evaluation of Merger Decisions," Working Papers 112/11, University of Southern Denmark, Department of Environmental and Business Economics.
  4. Mats Bergman, 2008. "Quis Custodiet Ipsos Custodes? or Measuring and Evaluating the Effectiveness of Competition Enforcement," De Economist, Springer, vol. 156(4), pages 387-409, December.
  5. Joseph A. Clougherty & Tomaso Duso, 2010. "Using Rival Effects to Identify Synergies and Improve Merger Typologies," CIG Working Papers SP II 2010-13, Wissenschaftszentrum Berlin (WZB), Research Unit: Competition and Innovation (CIG).
  6. Fridolfsson, Sven-Olof & Stennek, Johan, 2005. "Hold-up of anti-competitive mergers," International Journal of Industrial Organization, Elsevier, vol. 23(9-10), pages 753-775, December.
  7. Angelov, Nikolay, 2006. "Modelling firm mergers as a roommate problem," Working Paper Series 2006:10, Uppsala University, Department of Economics.
  8. Keller, Andreas, 2010. "Competition effects of mergers: An event study of the German electricity market," Energy Policy, Elsevier, vol. 38(9), pages 5264-5271, September.
  9. Budzinski, Oliver, 2012. "Empirische Ex-Post Evaluation von wettbewerbspolitischen Entscheidungen: Methodische Anmerkungen," Ilmenau Economics Discussion Papers 69, Ilmenau University of Technology, Institute of Economics.
  10. Budzinski, Oliver, 2012. "Impact evaluation of merger control decisions," Ilmenau Economics Discussion Papers 75, Ilmenau University of Technology, Institute of Economics.

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