Generics and New Goods in Pharmaceutical Price Indexes
AbstractWe 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%.
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Bibliographic InfoPaper provided by Harvard - Institute of Economic Research in its series Harvard Institute of Economic Research Working Papers with number 1664.
Length: 20 pages
Date of creation: 1993
Date of revision:
pharmaceutical industry ; prices;
Other versions of this item:
- Griliches, Zvi & Cockburn, Iain, 1994. "Generics and New Goods in Pharmaceutical Price Indexes," American Economic Review, American Economic Association, American Economic Association, vol. 84(5), pages 1213-32, December.
- Zvi Griliches & Iain Cockburn, 1993. "Generics and New Goods in Pharmaceutical Price Indexes," NBER Working Papers 4272, National Bureau of Economic Research, Inc.
- D12 - Microeconomics - - Household Behavior - - - Consumer Economics: Empirical Analysis
- L65 - Industrial Organization - - Industry Studies: Manufacturing - - - Chemicals; Rubber; Drugs; Biotechnology
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