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Merger Control in Differentiated Product

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  • Patrick Paul Walsh
  • Franco Mariuzzo
  • Ciara Whelan

    (Department of Economics, Trinity College)

Abstract

Thresholds defined on the level and change in the HHI (Herfindahl- Hirschmann Index) applied to market shares seem to be the main instrument to select notified mergers for investigation in both the EU and US. We question the use of such a selection rule in di?erentiated products industries. We propose the use of a structural approach to apply HHI thresholds based on profit shares rather than market shares. We illustrate our point using product data for Retail Carbonated Soft Drinks (Price, Market Share and Characteristics). We estimate company (product) mark-ups consistent with a structural model of equilibrium, using demand primitives from a Nested Logit model and a Random Coe?cient model. We provide an example where the HHI thresholds based on profit shares identify potentially damaging mergers not captured by applying thresholds to output shares, or conversely, identify mergers of no concern that would be selected on the basis of output shares.

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Bibliographic Info

Paper provided by Trinity College Dublin, Department of Economics in its series Trinity Economics Papers with number 2000510.

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Date of creation: Aug 2005
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Handle: RePEc:tcd:tcduee:2000510

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Postal: Trinity College, Dublin 2
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Web page: http://www.tcd.ie/Economics/
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  1. Aviv Nevo, 1998. "Measuring Market Power in the Ready-to-Eat Cereal Industry," NBER Working Papers 6387, National Bureau of Economic Research, Inc.
  2. Walsh, Patrick Paul & Whelan, Ciara, 1999. "Modelling Price Dispersion as an Outcome of Competition in the Irish Grocery Market," Journal of Industrial Economics, Wiley Blackwell, vol. 47(3), pages 325-43, September.
  3. Berry, Steven & Levinsohn, James & Pakes, Ariel, 1995. "Automobile Prices in Market Equilibrium," Econometrica, Econometric Society, vol. 63(4), pages 841-90, July.
  4. Franco Mariuzzo & Patrick Paul Walsh & Ciara Whelan, 2005. "Embedding Consumer Taste for Location into a Structural Model of Equilibrium," Working Papers 200503, School Of Economics, University College Dublin.
  5. Ivaldi, Marc & Verboven, Frank, 2001. "Quantifying the Effects from Horizontal Mergers in European Competition Policy," CEPR Discussion Papers 2697, C.E.P.R. Discussion Papers.
  6. Anderson, Simon P & de Palma, Andre, 1992. "Multiproduct Firms: A Nested Logit Approach," Journal of Industrial Economics, Wiley Blackwell, vol. 40(3), pages 261-76, September.
  7. Aviv Nevo, 2000. "A Practitioner's Guide to Estimation of Random-Coefficients Logit Models of Demand," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 9(4), pages 513-548, December.
  8. Jerry HAUSMAN & Gregory LEONARD & J. Douglas ZONA, 1994. "Competitive Analysis with Differentiated Products," Annales d'Economie et de Statistique, ENSAE, issue 34, pages 159-180.
  9. Franco Mariuzzo & Patrick Walsh & Ciara Whelan, 2003. "Firm Size and Market Power in Carbonated Soft Drinks," Review of Industrial Organization, Springer, vol. 23(3), pages 283-299, December.
  10. repec:tcd:wpaper:tep3 is not listed on IDEAS
  11. Steven Berry & James Levinsohn & Ariel Pakes, 1998. "Differentiated Products Demand Systems from a Combination of Micro and Macro Data: The New Car Market," NBER Working Papers 6481, National Bureau of Economic Research, Inc.
  12. Amil Petrin, 2002. "Quantifying the Benefits of New Products: The Case of the Minivan," Journal of Political Economy, University of Chicago Press, vol. 110(4), pages 705-729, August.
  13. Joris Pinkse & Margaret E. Slade & Craig Brett, 2002. "Spatial Price Competition: A Semiparametric Approach," Econometrica, Econometric Society, vol. 70(3), pages 1111-1153, May.
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