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Merger Control in Differentiated Product

Author

Listed:
  • 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.

Suggested Citation

  • Patrick Paul Walsh & Franco Mariuzzo & Ciara Whelan, 2005. "Merger Control in Differentiated Product," Trinity Economics Papers tep10, Trinity College Dublin, Department of Economics.
    • Handle: RePEc:tcd:tcduee:tep10
    as

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    File URL: http://www.tcd.ie/Economics/TEP/2005_papers/TEP10.pdf
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    References listed on IDEAS

    as
    1. Jerry Hausman & Gregory Leonard & J. Douglas Zona, 1994. "Competitive Analysis with Differentiated Products," Annals of Economics and Statistics, GENES, issue 34, pages 143-157.
    2. repec:adr:anecst:y:1994:i:34:p:06 is not listed on IDEAS
    3. Anderson, Simon P & de Palma, Andre, 1992. "Multiproduct Firms: A Nested Logit Approach," Journal of Industrial Economics, Wiley Blackwell, vol. 40(3), pages 261-276, September.
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    5. 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.
    6. Franco Mariuzzo & Patrick Walsh & Ciara Whelan, 2003. "Firm Size and Market Power in Carbonated Soft Drinks," Review of Industrial Organization, Springer;The Industrial Organization Society, vol. 23(3), pages 283-299, December.
    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.
    8. Patrick Paul Walsh & Franco Mariuzzo, 2005. "Embedding Consumer Taste for Location into a Structural Model of Equilibrium," Trinity Economics Papers tep3, Trinity College Dublin, Department of Economics.
    9. Steven Berry & James Levinsohn & Ariel Pakes, 2004. "Differentiated Products Demand Systems from a Combination of Micro and Macro Data: The New Car Market," Journal of Political Economy, University of Chicago Press, vol. 112(1), pages 68-105, February.
    10. Ivaldi, Marc & Verboven, Frank, 2005. "Quantifying the effects from horizontal mergers in European competition policy," International Journal of Industrial Organization, Elsevier, vol. 23(9-10), pages 669-691, December.
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    13. 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.
    14. Patrick Paul Walsh & Ciara Whelan, 1999. "Modelling Price Dispersion as an Outcome of Competition in the Irish Grocery Market," Journal of Industrial Economics, Wiley Blackwell, vol. 47(3), pages 325-343, September.
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    Full references (including those not matched with items on IDEAS)

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    More about this item

    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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