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Antitrust market definition using statistical learning techniques and consumer characteristics

By Willem H. Boshoff


Market definition is the first step in an antitrust case and relies on empirical evidence of substitution patterns. Cross-price elasticity estimates are preferred evidence for studying substitution patterns, due to advances in IO econometric modelling. However, the data and time requirements of these models weigh against their universal adoption for market definition purposes. These practical constraints — and the need for a greater variety of evidence — lead practitioners to rely on a larger set of less sophisticated tools for market definition. The paper proposes an addition to the existing toolkit, namely an analysis of consumer characteristics for market definition purposes. The paper shows how cluster analysis can be used to identify meaningful groups of substitutes on the basis of homogeneity of their consumer profiles. Cluster analysis enforces consistency, while recent bootstrap techniques ensure robust conclusions. To illustrate the tool, the paper relies on data from a recently concluded radio merger in South definition substitutes media demography clusters bootstrap

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  1. (1946). [1984]). The Meaning of Competition Individualism and Economic
  2. (2003). A critical analysis of critical loss analysis."
  3. (1967). A general theory of classificatory sorting strategies: 1 Hierarchical Systems."
  4. (1966). A new approach to consumer theory."
  5. (1967). A note on the history of perfect competition."
  6. (1980). A possible procedure for analysing quality differentials in the egg market."
  7. (2008). A practical guide to the hypothetical monopolist test for market definition."
  8. (2008). A SSNIP Test for Two-Sided Markets: The Case of Media."
  9. (1958). A statistical method for evaluating systematic relationships."
  10. (2005). Advertising Research Foundation
  11. (2002). An approximately unbiased test of phylogenetic tree selection."
  12. (2003). An examination of some tools for macro-econometric model building. Eighth African Econometrics Conference.S t e l l e n b o s c h .
  13. (2006). Antitrust Law on the Borderland of Language and Market Definition: Is There a Separate Spanish-Language Radio Market? A Case Study of the Merger of Univision and Hispanic Broadcasting Corporation."
  14. (2002). Applied Multivariate Statistical Analysis.U p p e r Saddle River,
  15. (2004). Approximately unbiased tests of regions using multistep-multiscale bootstrap resampling."
  16. (1995). Automobile prices in market equilibrium."
  17. (1996). Bootstrap confidence levels for phylogenetic trees."
  18. (1984). Classification and regression trees.
  19. (1973). Cluster Analysis for Applications.N e wY o r k ,A c a d e m i cP r e s s .
  20. (2009). clusterSim: Searching for optimal clustering procedure for ad a t as e t .
  21. (2006). Competition policy.
  22. (1985). Confidence limits on phylogenies: an approach using the bootstrap."
  23. (1971). Consumer demand
  24. (2002). Consumer substitution among media.
  25. (2009). Core Team
  26. (2003). Critical loss. Let’s tell the whole story." Antitrust Magazine Spring
  27. (2010). Defining A Product Market for Spanish-Language Broadcast Media: Lessons from United States v. Univision Communications, Inc. and Hispanic Broadcasting."
  28. (1981). Departures from Marginal-Cost Pricing in the American Automobile Industry: Estimates for 1977-1978."
  29. (2008). Determining the predictors of living standards in South Africa: a real world econometric approach."
  30. (2004). Discussion of ‘Using stationarity tests in antitrust market definition’."
  31. (1981). Econometric Models of Probabilistic Choice. Structural Analysis of Discrete Data with Econometric Applications.C .F .M a n s k ia n d
  32. (1999). Empirical methods in antitrust litigation: review and critique."
  33. (2004). Estimating Differentiated Product Demand Systems from a Combination of Micro and Macro Data: The New Car Model."
  34. (1994). Estimating discrete-choice models of product differentiation."
  35. (2007). Estimating market power in a two-sided market: the case of newspapers."
  36. (2001). Estimating the number of clusters in a data set via the gap statistic."
  37. (1977). Exploratory data analysis.
  38. (1990). Finding groups in data: an introduction to cluster analysis.
  39. (1987). Geographic market definition under the U.S. Department of Justice Meger Guidelines."
  40. (1967). Hierarchical clustering schemes."
  41. (2010). Horizontal merger guidelines.
  42. (2009). Innovation and the Limits of Antitrust.
  43. (2002). Intermedia substitutability and market demand by national advertisers."
  44. (1999). Is Radio Advertising a Distinct Local Market? An Empirical Analysis."
  45. (1994). Market definition and competition issues in commercial broadcast radio.
  46. (2000). Market definition and market power in competition analysis: some practical issues."
  47. (2010). Market definition in a two-sided market: the case of newspapers. Competition and Regulation
  48. (2002). Market Definition in the Media Sector: Economic Issues. Brussels, European Commission: Director-General Competition.
  49. (2001). Measuring market power in the ready-to-eat cereal industry."
  50. (1990). Monotone smoothing with application to dose-response curves and the assessment of synergism."
  51. (2009). Multisided media markets: applying the theory of multisided markets to media markets.
  52. (1995). Non-uniqueness and inversions in cluster analysis."
  53. (2008). Primedia Ltd, Capricorn Capital Partners Pty Ltd,
  54. (2009). pvclust: Hierarchical Clustering with P-Values via Multiscale Bootstrap Resampling.
  55. (2002). Quantifying the benefits of new products: the case of the minivan."
  56. (2005). Quantifying the effects from horizontal mergers in European competition policy."
  57. (2010). Quantitative techniques for competition and antitrust analysis.
  58. (2004). Radio Mergers Are Not Substantial: The impact of the Communications Act and the Enterprise Act on radio merger. London, Commercial Radio Companies Association.
  59. (2010). Recapture, Pass-Through, and Market Definition."
  60. (1991). Residual demand estimation for market delineation: complications and limitations."
  61. (2002). The economics of EC competition law: concepts, application
  62. (2003). The economics of media markets.
  63. (2001). The elements of statistical learning: data mining , inference and prediction.
  64. (2009). Two-Sided Market Definition." ABA Section of Antitrust Law, Market definition in antitrust: theory and case studies. Forthcoming

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