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Consumer Learning and Heterogeneity: Dynamics of Demand for Prescription Drugs after Patent Expiration

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  • Ching, Andrew

Abstract

This paper investigates whether aggregate consumer learning together with consumer heterogeneity in price sensitivity could explain why (i) there is a slow diffusion of generic drugs into the market, and (ii) brand-name originators keep increasing their prices over time even after the number of generic entrants has become fixed. To examine these hypotheses, I estimate a structural demand model that incorporates consumer learning and heterogeneity in price sensitivity. By conducting a counterfactual experiment, which eliminates the uncertainty of generics, I find that learning plays a role in explaining the slow diffusion. By simulating the model, I find that the branded pricing pattern could be explained by: (a) the diffusion rate of generics for price-sensitive patients is faster than that for price-insensitive patients, causing the proportion of price-insensitive patients faced by brand-name firms to slowly increase over time; (b) the brand-name price elasticities of demand (evaluated at the observed prices) are often less than one and increase over time, suggesting that brand-name firms may set their prices lower than what they would do if they were myopic, in order to slow down the learning process for generic qualities. But such an incentive diminishes over time as the uncertainty slowly resolves.

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Bibliographic Info

Paper provided by University Library of Munich, Germany in its series MPRA Paper with number 7265.

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Date of creation: 16 Feb 2008
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Handle: RePEc:pra:mprapa:7265

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Keywords: Consumer Learning; Consumer Heterogeneity; Brand-name drugs; Generic Drugs; Patent Expiration; Demand Analysis;

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  1. Keane, Michael P, 1994. "A Computationally Practical Simulation Estimator for Panel Data," Econometrica, Econometric Society, vol. 62(1), pages 95-116, January.
  2. Jonathan Levin (Stanford University) & Pat Bajari & Lanier Benkard, 2004. "Estimating Dynamic Models of Imperfect Competition," Econometric Society 2004 North American Winter Meetings 627, Econometric Society.
  3. Andrew Ching & Masakazu Ishihara, 2010. "The effects of detailing on prescribing decisions under quality uncertainty," Quantitative Marketing and Economics, Springer, vol. 8(2), pages 123-165, June.
  4. Ernst R. Berndt & Linda T. Bui & David H. Lucking-Reiley & Glen L. Urban, 1996. "The Roles of Marketing, Product Quality, and Price Competition in the Growth and Composition of the U.S. Antiulcer Drug Industry," NBER Chapters, in: The Economics of New Goods, pages 277-328 National Bureau of Economic Research, Inc.
  5. Richard G. Frank & David S. Salkever, 1997. "Generic Entry and the Pricing of Pharmaceuticals," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 6(1), pages 75-90, 03.
  6. Glenn Ellison & Sara Fisher Ellison, 2007. "Strategic Entry Deterrence and the Behavior of Pharmaceutical Incumbents Prior to Patent Expiration," NBER Working Papers 13069, National Bureau of Economic Research, Inc.
  7. G. Steven Olley & Ariel Pakes, 1992. "The Dynamics of Productivity in the Telecommunications Equipment Industry," NBER Working Papers 3977, National Bureau of Economic Research, Inc.
  8. McFadden, Daniel, 1989. "A Method of Simulated Moments for Estimation of Discrete Response Models without Numerical Integration," Econometrica, Econometric Society, vol. 57(5), pages 995-1026, September.
  9. Pakes, Ariel & Pollard, David, 1989. "Simulation and the Asymptotics of Optimization Estimators," Econometrica, Econometric Society, vol. 57(5), pages 1027-57, September.
  10. Ellison, S & Cockburn, I & Griliches, A & Hausman, J, 1996. "Characteristics of Demand for Pharmaceutical Products : an Examination of four Cephalosporins," Working papers 96-24, Massachusetts Institute of Technology (MIT), Department of Economics.
  11. John H. Roberts & Glen L. Urban, 1988. "Modeling Multiattribute Utility, Risk, and Belief Dynamics for New Consumer Durable Brand Choice," Management Science, INFORMS, vol. 34(2), pages 167-185, February.
  12. Ernst R. Berndt & Robert S. Pindyck & Pierre Azoulay, 2000. "Consumption Externalities and Diffusion in Pharmaceutical Markets: Antiulcer Drugs," NBER Working Papers 7772, National Bureau of Economic Research, Inc.
  13. David Reiffen & Michael R. Ward, 2005. "Generic Drug Industry Dynamics," The Review of Economics and Statistics, MIT Press, vol. 87(1), pages 37-49, February.
  14. Erdem, Tulin & Keane, Michael P. & Sun, Baohong, 1998. "Missing price and coupon availability data in scanner panels: Correcting for the self-selection bias in choice model parameters," Journal of Econometrics, Elsevier, vol. 89(1-2), pages 177-196, November.
  15. James J. Heckman, 1981. "Heterogeneity and State Dependence," NBER Chapters, in: Studies in Labor Markets, pages 91-140 National Bureau of Economic Research, Inc.
  16. Steven T. Berry, 1994. "Estimating Discrete-Choice Models of Product Differentiation," RAND Journal of Economics, The RAND Corporation, vol. 25(2), pages 242-262, Summer.
  17. Tülin Erdem & Michael P. Keane, 1996. "Decision-Making Under Uncertainty: Capturing Dynamic Brand Choice Processes in Turbulent Consumer Goods Markets," Marketing Science, INFORMS, vol. 15(1), pages 1-20.
  18. Ching, Andrew, 2008. "Consumer Learning and Heterogeneity: Dynamics of Demand for Prescription Drugs after Patent Expiration," MPRA Paper 7265, University Library of Munich, Germany.
  19. Fiona M. Scott Morton, 1999. "Entry Decisions in the Generic Pharmaceutical Industry," RAND Journal of Economics, The RAND Corporation, vol. 30(3), pages 421-440, Autumn.
  20. Coscelli, Andrea & Shum, Matthew, 2004. "An empirical model of learning and patient spillovers in new drug entry," Journal of Econometrics, Elsevier, vol. 122(2), pages 213-246, October.
  21. Grabowski, Henry G & Vernon, John M, 1992. "Brand Loyalty, Entry, and Price Competition in Pharmaceuticals after the 1984 Drug Act," Journal of Law and Economics, University of Chicago Press, vol. 35(2), pages 331-50, October.
  22. Berry, Steven & Levinsohn, James & Pakes, Ariel, 1995. "Automobile Prices in Market Equilibrium," Econometrica, Econometric Society, vol. 63(4), pages 841-90, July.
  23. Cardell, N. Scott, 1997. "Variance Components Structures for the Extreme-Value and Logistic Distributions with Application to Models of Heterogeneity," Econometric Theory, Cambridge University Press, vol. 13(02), pages 185-213, April.
  24. Scott Morton, Fiona M., 2000. "Barriers to entry, brand advertising, and generic entry in the US pharmaceutical industry," International Journal of Industrial Organization, Elsevier, vol. 18(7), pages 1085-1104, October.
  25. Judith K. Hellerstein, 1998. "The Importance of the Physician in the Generic Versus Trade-Name Prescription Decision," RAND Journal of Economics, The RAND Corporation, vol. 29(1), pages 108-136, Spring.
  26. Richard G. Frank & David S. Salkever, 1995. "Generic Entry and the Pricing of Pharmaceuticals," NBER Working Papers 5306, National Bureau of Economic Research, Inc.
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