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Generics and New Goods in Pharmaceutical Price Indexes

Author

Listed:
  • Griliches, Z.
  • Cockborn, I.
Abstract
We examine the issue of new goods and price indexes for the important and tractable case of generic and branded drugs. By treating generics as entirely distinct goods and "linking them in" to indexes with fixed weights, the standard price indexes fail to reflect the substantial welfare gains to those consumers who, like the FDA, regard generic and branded versions of a drug as being perfect substitutes. We discuss the treatment of heterogenous consumers in constructing aggregate price indexes, and then, using detailed data on wholesale prices of two anti-infective drugs, present calculations of various alternatives to the official indexes. These reflect both heterogeneity of tastes for brandedness, and also the empirically important phenomenon of diffusion of generic drugs into the market following patent expiration. We find very significant differences: for one of the drugs studied, the standard price index rose by 14% over the sample period, while our preferred alternative index fell by 48%.
(This abstract was borrowed from another version of this item.)

Suggested Citation

  • Griliches, Z. & Cockborn, I., 1993. "Generics and New Goods in Pharmaceutical Price Indexes," Harvard Institute of Economic Research Working Papers 1664, Harvard - Institute of Economic Research.
    • Handle: RePEc:fth:harver:1664
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    References listed on IDEAS

    as
    1. Fisher, Franklin M. & Shell, Karl, 1972. "The Economic Theory of Price Indices," Elsevier Monographs, Elsevier, edition 1, number 9780122577505 edited by Shell, Karl.
    2. Feenstra, Robert C & Markusen, James R, 1994. "Accounting for Growth with New Inputs," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 35(2), pages 429-447, May.
    3. Dixit, Avinash K & Stiglitz, Joseph E, 1977. "Monopolistic Competition and Optimum Product Diversity," American Economic Review, American Economic Association, vol. 67(3), pages 297-308, June.
    4. Berndt, Ernst R & Griliches, Zvi & Rosett, Joshua G, 1993. "Auditing the Producer Price Index: Micro Evidence from Prescription Pharamceutical Preparations," Journal of Business & Economic Statistics, American Statistical Association, vol. 11(3), pages 251-264, July.
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    More about this item

    Keywords

    pharmaceutical industry ; prices;

    JEL classification:

    • D12 - Microeconomics - - Household Behavior - - - Consumer Economics: Empirical Analysis
    • L65 - Industrial Organization - - Industry Studies: Manufacturing - - - Chemicals; Rubber; Drugs; Biotechnology; Plastics

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