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Ernst R. Berndt, Iain M. Cockburn, Zvi Griliches, Theodore E. Keeler, Martin Neil Baily, Pharmaceutical Innovations and Market Dynamics: Tracking Effects on Price Indexes for Antidepressant Drugs, Brookings Papers on Economic Activity. Microeconomics, Vol. 1996 (1996), pp. 133-199
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Berndt et al. (1996) studied this question.
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