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Merger Control in Differentiated Product

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Author Info
Patrick Paul Walsh
Franco Mariuzzo
Ciara Whelan (Department of Economics, Trinity College)

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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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Paper provided by Trinity College Dublin, Department of Economics in its series Trinity Economics Papers with number tep10.

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Date of creation: Aug 2005
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Handle: RePEc:tcd:tcduee:tep10

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Find related papers by JEL classification:
K2 - Law and Economics - - Regulation and Business Law
L11 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Production, Pricing, and Market Structure; Size Distribution of Firms
L25 - Industrial Organization - - Firm Objectives, Organization, and Behavior - - - Firm Performance
L40 - Industrial Organization - - Antitrust Issues and Policies - - - General
L81 - Industrial Organization - - Industry Studies: Services - - - Retail and Wholesale Trade; e-Commerce

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  1. 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. [Downloadable!] (restricted)
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  2. Walsh, Patrick Paul & Whelan, Ciara, 1999. "Modelling Price Dispersion as an Outcome of Competition in the Irish Grocery Market," Journal of Industrial Economics, Blackwell Publishing, vol. 47(3), pages 325-43, September. [Downloadable!] (restricted)
  3. 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. [Downloadable!] (restricted)
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  4. 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. [Downloadable!] (restricted)
  5. Jerry A. Hausman & Gregory Leonard & J. Douglas Zona, 1994. "Competitive Analysis with Differentiated Products," Annales d'Economie et de Statistique, ADRES, issue 34, pages 07, Avril-Jui. [Downloadable!]
  6. Franco Mariuzzo & Patrick Paul Walsh & Ciara Whelan, 2003. "Firm Size and Market Power in Carbonated Soft Drinks," Review of Industrial Organization, Springer, vol. 23(3_4), pages 283-299, December. [Downloadable!]
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  7. Joris Pinkse & Margaret E. Slade & Craig Brett, 2002. "Spatial Price Competition: A Semiparametric Approach," Econometrica, Econometric Society, vol. 70(3), pages 1111-1153, May. [Downloadable!] (restricted)
  8. repec:tcd:wpaper:tep3 is not listed on IDEAS
  9. Anderson, Simon P & de Palma, Andre, 1992. "Multiproduct Firms: A Nested Logit Approach," Journal of Industrial Economics, Blackwell Publishing, vol. 40(3), pages 261-76, September. [Downloadable!] (restricted)
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  10. Nevo, Aviv, 2001. "Measuring Market Power in the Ready-to-Eat Cereal Industry," Econometrica, Econometric Society, vol. 69(2), pages 307-42, March.
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  11. Steven T. Berry, 1994. "Estimating Discrete-Choice Models of Product Differentiation," RAND Journal of Economics, The RAND Corporation, vol. 25(2), pages 242-262, Summer. [Downloadable!] (restricted)
  12. 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. [Downloadable!]
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  13. Berry, Steven & Levinsohn, James & Pakes, Ariel, 1995. "Automobile Prices in Market Equilibrium," Econometrica, Econometric Society, vol. 63(4), pages 841-90, July. [Downloadable!] (restricted)
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