Aggregate Price Indices, New Goods, and Generics

Franklin M. Fisher and Zvi Griliches

The Quarterly Journal of Economics, 1995, vol. 110, issue 1, 229-244

Abstract: This paper examines the appropriate treatment in the cost-of-living index of the appearance of new varieties of old goods. Existing theory here applies to individual households. Thus, we first show in what sense Laspeyres and Paasche indices for groups of households can be considered approximations to theoretically desirable group indices and then go on to the case of new goods. We apply our results to the case of the introduction of generics in pharmaceuticals and show that proper treatment can make a considerable difference.

Date: 1995
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