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Sequential versus simultaneous market

  • Haldrup, Niels

    (Department of Economics, Copenhagen Business School)

  • Møllgaard, Peter

    (Department of Economics, Copenhagen Business School)

  • Nielsen, Claus Kastberg

    (Department of Economics, Copenhagen Business School)

Delineation of the relevant market forms a pivotal part of most antitrust cases. The standard approach is sequential. First the product market is delineated, then the geographical market is defined. Demand and supply substitution in both the product dimension and the geographical dimension will normally be stronger than substitution in either dimension. By ignoring this one might decide first to define products narrowly and then to define the geographical extent narrowly ignoring the possibility of a diagonal substitution. These reflections are important in the empirical delineation of product and geographical markets. Using a unique data set for prices of Norwegian and Scottish salmon, we propose a methodology for simultaneous market delineation and we demonstrate that compared to a sequential approach conclusions will be reversed.

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File URL: http://openarchive.cbs.dk/cbsweb/handle/10398/7633
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Paper provided by Copenhagen Business School, Department of Economics in its series Working Papers with number 02-2005.

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Length: 24 pages
Date of creation: 15 Mar 2005
Date of revision:
Handle: RePEc:hhs:cbsnow:2005_002
Contact details of provider: Postal: Department of Economics, Copenhagen Business School, Solbjerg Plads 3 C, 5. sal, DK-2000 Frederiksberg, Denmark
Phone: 38 15 25 75
Fax: 38 15 34 99
Web page: http://www.cbs.dk/departments/econ/
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  1. Kwiatkowski, Denis & Phillips, Peter C. B. & Schmidt, Peter & Shin, Yongcheol, 1992. "Testing the null hypothesis of stationarity against the alternative of a unit root : How sure are we that economic time series have a unit root?," Journal of Econometrics, Elsevier, vol. 54(1-3), pages 159-178.
  2. Haldrup, Niels, . "Empirical analysis of price data in the delineation of the relevant geographical market in competition analysis," Economics Working Papers 2003-9, School of Economics and Management, University of Aarhus.
  3. Asche, Frank & Steen, Frode, 2006. "When Anti-Dumping Measures Lead to Increased Market Power: A Case Study of the European Salmon Market," CEPR Discussion Papers 5781, C.E.P.R. Discussion Papers.
  4. Engle, Robert F & Granger, Clive W J, 1987. "Co-integration and Error Correction: Representation, Estimation, and Testing," Econometrica, Econometric Society, vol. 55(2), pages 251-76, March.
  5. George J. Stigler & Robert A. Sherwin, 1983. "The Extent of the Market," University of Chicago - George G. Stigler Center for Study of Economy and State 31, Chicago - Center for Study of Economy and State.
  6. Gonzalo, Jesus, 1994. "Five alternative methods of estimating long-run equilibrium relationships," Journal of Econometrics, Elsevier, vol. 60(1-2), pages 203-233.
  7. Franses, Philip Hans & Haldrup, Niels, 1994. "The Effects of Additive Outliers on Tests for Unit Roots and Cointegration," Journal of Business & Economic Statistics, American Statistical Association, vol. 12(4), pages 471-78, October.
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