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Identification in Differentiated Products Markets



Empirical models of demand for -- and, often, supply of -- differentiated products are widely used in practice, typically employing parametric functional forms and distributions of consumer heterogeneity. We review some recent work studying identification in a broad class of such models. This work shows that parametric functional forms and distributional assumptions are not essential for identification. Rather, identification relies primarily on the standard requirement that instruments be available for the endogenous variables -- here, typically, prices and quantities. We discuss the kinds of instruments needed for identification and how the reliance on instruments can be reduced by nonparametric functional form restrictions or better data. We also discuss results on discrimination between alternative models of oligopoly competition.

Suggested Citation

  • Steven T. Berry & Philip A. Haile, 2015. "Identification in Differentiated Products Markets," Cowles Foundation Discussion Papers 2019, Cowles Foundation for Research in Economics, Yale University.
  • Handle: RePEc:cwl:cwldpp:2019

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    References listed on IDEAS

    1. Reynaert, Mathias & Verboven, Frank, 2014. "Improving the performance of random coefficients demand models: The role of optimal instruments," Journal of Econometrics, Elsevier, vol. 179(1), pages 83-98.
    2. Lau, Lawrence J., 1982. "On identifying the degree of competitiveness from industry price and output data," Economics Letters, Elsevier, vol. 10(1-2), pages 93-99.
    3. Victor Chernozhukov & Christian Hansen, 2005. "An IV Model of Quantile Treatment Effects," Econometrica, Econometric Society, vol. 73(1), pages 245-261, January.
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    Cited by:

    1. Deng, Zhongqi & Chen, Yongjun, 2016. "Markups and Firm-Level Export Status: Comment," MPRA Paper 74494, University Library of Munich, Germany.
    2. Mogens Fosgerau & Abhishek Ranjan, 2017. "A note on identification in discrete choice models with partial observability," Theory and Decision, Springer, vol. 83(2), pages 283-292, August.

    More about this item


    Nonparametric identification; Instrumental variables; Discrete choice; Differentiated products oligopoly; Demand and supply; Firm conduct;

    JEL classification:

    • C3 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables
    • D12 - Microeconomics - - Household Behavior - - - Consumer Economics: Empirical Analysis
    • D22 - Microeconomics - - Production and Organizations - - - Firm Behavior: Empirical Analysis
    • D4 - Microeconomics - - Market Structure, Pricing, and Design
    • L1 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance

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