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Generic competition and the incentives for early-stage pharmaceutical innovation

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  • Branstetter, Lee
  • Chatterjee, Chirantan
  • Higgins, Matthew J.

Abstract

What impact has rising generic competition had on the nature and direction of pharmaceutical innovation? We find broad-based, strong evidence that pharmaceutical companies have diverted their new drug development efforts away from therapeutic markets already well-served by generic drugs. We also find that increasing generic competition induces firms to shift their R&D activity toward more biologic-based products and away from chemical-based products. We conclude by discussing potential implications of our results for long-run innovation policy.

Suggested Citation

  • Branstetter, Lee & Chatterjee, Chirantan & Higgins, Matthew J., 2022. "Generic competition and the incentives for early-stage pharmaceutical innovation," Research Policy, Elsevier, vol. 51(10).
  • Handle: RePEc:eee:respol:v:51:y:2022:i:10:s0048733322001184
    DOI: 10.1016/j.respol.2022.104595
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    1. Ernst Berndt & Murray Aitken, 2011. "Brand Loyalty, Generic Entry and Price Competition in Pharmaceuticals in the Quarter Century after the 1984 Waxman-Hatch Legislation," International Journal of the Economics of Business, Taylor & Francis Journals, vol. 18(2), pages 177-201.
    2. Nina Pavcnik, 2002. "Trade Liberalization, Exit, and Productivity Improvements: Evidence from Chilean Plants," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 69(1), pages 245-276.
    3. DiMasi, Joseph A. & Grabowski, Henry G. & Hansen, Ronald W., 2016. "Innovation in the pharmaceutical industry: New estimates of R&D costs," Journal of Health Economics, Elsevier, vol. 47(C), pages 20-33.
    4. David J. TEECE, 2008. "Profiting from technological innovation: Implications for integration, collaboration, licensing and public policy," World Scientific Book Chapters, in: The Transfer And Licensing Of Know-How And Intellectual Property Understanding the Multinational Enterprise in the Modern World, chapter 5, pages 67-87, World Scientific Publishing Co. Pte. Ltd..
    5. repec:adr:anecst:y:2005:i:79-80:p:07 is not listed on IDEAS
    6. Walsh, Vivien, 1984. "Invention and innovation in the chemical industry: Demand-pull or discovery-push?," Research Policy, Elsevier, vol. 13(4), pages 211-234, August.
    7. Breusch, T S, 1978. "Testing for Autocorrelation in Dynamic Linear Models," Australian Economic Papers, Wiley Blackwell, vol. 17(31), pages 334-355, December.
    8. DiMasi, Joseph A. & Hansen, Ronald W. & Grabowski, Henry G. & Lasagna, Louis, 1991. "Cost of innovation in the pharmaceutical industry," Journal of Health Economics, Elsevier, vol. 10(2), pages 107-142, July.
    9. Scherer, F.M., 2010. "Pharmaceutical Innovation," Handbook of the Economics of Innovation, in: Bronwyn H. Hall & Nathan Rosenberg (ed.), Handbook of the Economics of Innovation, edition 1, volume 1, chapter 0, pages 539-574, Elsevier.
    10. Eckel, Carsten & Iacovone, Leonardo & Javorcik, Beata & Neary, J. Peter, 2015. "Multi-product firms at home and away: Cost- versus quality-based competence," Journal of International Economics, Elsevier, vol. 95(2), pages 216-232.
    11. Jeffrey Furman & Margaret K. Kyle & Alain Cockburn & Rebecca M. Henderson, 2005. "Public & Private Spillovers: Location and the Productivity of Pharmaceutical Research," Annals of Economics and Statistics, GENES, issue 79-80, pages 165-188.
    12. Abe Dunn, 2012. "Drug Innovations and Welfare Measures Computed from Market Demand: The Case of Anti-cholesterol Drugs," American Economic Journal: Applied Economics, American Economic Association, vol. 4(3), pages 167-189, July.
    13. Andrew B. Bernard & Stephen J. Redding & Peter K. Schott, 2006. "Multi-Product Firms and Product Switching," NBER Working Papers 12293, National Bureau of Economic Research, Inc.
    14. Daron Acemoglu & Joshua Linn, 2004. "Market Size in Innovation: Theory and Evidence from the Pharmaceutical Industry," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 119(3), pages 1049-1090.
    15. Vincenzo Palermo & Matthew J. Higgins & Marco Ceccagnoli, 2019. "How Reliable Is the Market for Technology?," The Review of Economics and Statistics, MIT Press, vol. 101(1), pages 107-120, March.
    16. Carsten Eckel & J. Peter Neary, 2010. "Multi-Product Firms and Flexible Manufacturing in the Global Economy," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 77(1), pages 188-217.
    17. Lee Branstetter & Chirantan Chatterjee & Matthew J. Higgins, 2016. "Regulation and welfare: evidence from paragraph IV generic entry in the pharmaceutical industry," RAND Journal of Economics, RAND Corporation, vol. 47(4), pages 857-890, November.
    18. Pierre Dubois & Olivier de Mouzon & Fiona Scott-Morton & Paul Seabright, 2015. "Market size and pharmaceutical innovation," RAND Journal of Economics, RAND Corporation, vol. 46(4), pages 844-871, October.
    19. Farasat A. S. Bokhari & Gary M. Fournier, 2013. "Entry in the ADHD drugs market: Welfare impact of generics and me-too's," Journal of Industrial Economics, Wiley Blackwell, vol. 61(2), pages 339-392, June.
    20. Wesley M. Cohen & Richard R. Nelson & John P. Walsh, 2003. "Links and Impacts: The Influence of Public Research on Industrial R&D," Chapters, in: Aldo Geuna & Ammon J. Salter & W. Edward Steinmueller (ed.), Science and Innovation, chapter 4, Edward Elgar Publishing.
    21. Olley, G Steven & Pakes, Ariel, 1996. "The Dynamics of Productivity in the Telecommunications Equipment Industry," Econometrica, Econometric Society, vol. 64(6), pages 1263-1297, November.
    22. Hausman, Jerry & Hall, Bronwyn H & Griliches, Zvi, 1984. "Econometric Models for Count Data with an Application to the Patents-R&D Relationship," Econometrica, Econometric Society, vol. 52(4), pages 909-938, July.
    23. Trusheim Mark R. & Aitken Murray L. & Berndt Ernst R., 2010. "Characterizing Markets for Biopharmaceutical Innovations: Do Biologics Differ from Small Molecules?," Forum for Health Economics & Policy, De Gruyter, vol. 13(1), pages 1-45, July.
    24. Frank Lichtenberg, 2000. "The Benefits and Costs of Newer Drugs: Evidence from the 1996 Medical Expenditure Panel Survey," CESifo Working Paper Series 404, CESifo.
    25. Volker Nocke & Stephen Yeaple, 2014. "Globalization And Multiproduct Firms," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 55(4), pages 993-1018, November.
    26. Marco Ceccagnoli & Stuart J.H. Graham & Matthew J. Higgins & Jeongsik Lee, 2010. "Productivity and the role of complementary assets in firms' demand for technology innovations," Industrial and Corporate Change, Oxford University Press and the Associazione ICC, vol. 19(3), pages 839-869, June.
    27. Samuel S. Kortum, 1997. "Research, Patenting, and Technological Change," Econometrica, Econometric Society, vol. 65(6), pages 1389-1420, November.
    28. Paul Ellickson & Scott Stern & Manuel Trajtenberg, 2001. "Patient Welfare and Patient Compliance -- An Empirical Framework for Measuring the Benefits from Pharmaceutical Innovation," NBER Chapters, in: Medical Care Output and Productivity, pages 539-564, National Bureau of Economic Research, Inc.
    29. Amy Finkelstein, 2004. "Static and Dynamic Effects of Health Policy: Evidence from the Vaccine Industry," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 119(2), pages 527-564.
    30. Evenson, Robert E & Kislev, Yoav, 1976. "A Stochastic Model of Applied Research," Journal of Political Economy, University of Chicago Press, vol. 84(2), pages 265-281, April.
    31. Wooldridge, Jeffrey M., 1999. "Distribution-free estimation of some nonlinear panel data models," Journal of Econometrics, Elsevier, vol. 90(1), pages 77-97, May.
    32. Golec, Joseph & Hegde, Shantaram & Vernon, John A., 2010. "Pharmaceutical R&D Spending and Threats of Price Regulation," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 45(1), pages 239-264, February.
    33. Hausman, Jerry A. & Lo, Andrew W. & MacKinlay, A. Craig, 1992. "An ordered probit analysis of transaction stock prices," Journal of Financial Economics, Elsevier, vol. 31(3), pages 319-379, June.
    34. Alessandro Iaria & Carlo Schwarz & Fabian Waldinger, 2018. "Frontier Knowledge and Scientific Production: Evidence from the Collapse of International Science," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 133(2), pages 927-991.
    35. Eric Budish & Benjamin N. Roin & Heidi Williams, 2015. "Do Firms Underinvest in Long-Term Research? Evidence from Cancer Clinical Trials," American Economic Review, American Economic Association, vol. 105(7), pages 2044-2085, July.
    36. Arcidiacono, Peter & Ellickson, Paul B. & Landry, Peter & Ridley, David B., 2013. "Pharmaceutical followers," International Journal of Industrial Organization, Elsevier, vol. 31(5), pages 538-553.
    37. Eric Budish & Benjamin Roin & Heidi Williams, 2013. "Do fixed patent terms distort innovation? Evidence from cancer clinical trials," Discussion Papers 13-001, Stanford Institute for Economic Policy Research.
    38. Daron Acemoglu & Simon Johnson, 2007. "Disease and Development: The Effect of Life Expectancy on Economic Growth," Journal of Political Economy, University of Chicago Press, vol. 115(6), pages 925-985, December.
    39. Zvi Griliches, 1984. "R&D, Patents, and Productivity," NBER Books, National Bureau of Economic Research, Inc, number gril84-1.
    40. Tat Chan & Jack A. Nickerson & Hideo Owan, 2007. "Strategic Management of R& D Pipelines with Cospecialized Investments and Technology Markets," Management Science, INFORMS, vol. 53(4), pages 667-682, April.
    41. Volker Nocke & Stephen Yeaple, 2014. "Globalization And Multiproduct Firms," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 55, pages 993-1018, November.
    42. Joseph P. Cook & Graeme Hunter & John A. Vernon, 2010. "Generic Utilization Rates, Real Pharmaceutical Prices, and Research and Development Expenditures," NBER Working Papers 15723, National Bureau of Economic Research, Inc.
    43. Utterback, James M. & Suarez, Fernando F., 1993. "Innovation, competition, and industry structure," Research Policy, Elsevier, vol. 22(1), pages 1-21, February.
    44. Hemphill, C. Scott & Sampat, Bhaven N., 2012. "Evergreening, patent challenges, and effective market life in pharmaceuticals," Journal of Health Economics, Elsevier, vol. 31(2), pages 327-339.
    45. Blundell, Richard & Bond, Stephen, 1998. "Initial conditions and moment restrictions in dynamic panel data models," Journal of Econometrics, Elsevier, vol. 87(1), pages 115-143, August.
    46. Ernst R. Berndt & Murray L. Aitken, 2010. "Brand Loyalty, Generic Entry and Price Competition in Pharmaceuticals in the Quarter Century After the 1984 Waxman-Hatch Legislation," NBER Working Papers 16431, National Bureau of Economic Research, Inc.
    47. Henry G. Grabowski & Margaret Kyle, 2007. "Generic competition and market exclusivity periods in pharmaceuticals," Managerial and Decision Economics, John Wiley & Sons, Ltd., vol. 28(4-5), pages 491-502.
    48. James W. Hughes & Michael J. Moore & Edward A. Snyder, 2002. ""Napsterizing" Pharmaceuticals: Access, Innovation, and Consumer Welfare," NBER Working Papers 9229, National Bureau of Economic Research, Inc.
    49. Panattoni, Laura E., 2011. "The effect of Paragraph IV decisions and generic entry before patent expiration on brand pharmaceutical firms," Journal of Health Economics, Elsevier, vol. 30(1), pages 126-145, January.
    50. Christian Catalini, 2018. "Microgeography and the Direction of Inventive Activity," Management Science, INFORMS, vol. 64(9), pages 4348-4364, September.
    51. Pisano, Gary, 2006. "Profiting from innovation and the intellectual property revolution," Research Policy, Elsevier, vol. 35(8), pages 1122-1130, October.
    52. Cohen, Wesley M., 2010. "Fifty Years of Empirical Studies of Innovative Activity and Performance," Handbook of the Economics of Innovation, in: Bronwyn H. Hall & Nathan Rosenberg (ed.), Handbook of the Economics of Innovation, edition 1, volume 1, chapter 0, pages 129-213, Elsevier.
    53. Atanu Saha & Henry Grabowski & Howard Birnbaum & Paul Greenberg & Oded Bizan, 2006. "Generic Competition in the US Pharmaceutical Industry," International Journal of the Economics of Business, Taylor & Francis Journals, vol. 13(1), pages 15-38.
    54. Godfrey, Leslie G, 1978. "Testing against General Autoregressive and Moving Average Error Models When the Regressors Include Lagged Dependent Variables," Econometrica, Econometric Society, vol. 46(6), pages 1293-1301, November.
    55. Mark R. Trusheim & Murray L. Aitken & Ernst R. Berndt, 2010. "Characterizing Markets for Biopharmaceutical Innovations: Do Biologics Differ from Small Molecules?," NBER Chapters, in: Frontiers in Health Policy Research, volume 13, National Bureau of Economic Research, Inc.
    56. C. Scott Hemphill & Bhaven N. Sampat, 2011. "When Do Generics Challenge Drug Patents?," Journal of Empirical Legal Studies, John Wiley & Sons, vol. 8(4), pages 613-649, December.
    57. Mansfield, Edwin, 1995. "Academic Research Underlying Industrial Innovations:," The Review of Economics and Statistics, MIT Press, vol. 77(1), pages 55-65, February.
    58. Tang, Jianmin, 2006. "Competition and innovation behaviour," Research Policy, Elsevier, vol. 35(1), pages 68-82, February.
    59. Michelle Gittelman & Bruce Kogut, 2003. "Does Good Science Lead to Valuable Knowledge? Biotechnology Firms and the Evolutionary Logic of Citation Patterns," Management Science, INFORMS, vol. 49(4), pages 366-382, April.
    60. Jing-Yuan Chio & Laura Magazzini & Fabio Pammolli & Massimo Riccaboni, 2012. "The Value of Failures in Pharmaceutical R&D," Working Papers 1/2012, IMT School for Advanced Studies Lucca, revised Jan 2012.
    61. Manuel Arellano & Stephen Bond, 1991. "Some Tests of Specification for Panel Data: Monte Carlo Evidence and an Application to Employment Equations," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 58(2), pages 277-297.
    62. 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.
    63. Mark Trusheim & Murray L. Aitken & Ernst R. Berndt, 2010. "Characterizing Markets for Biopharmaceutical Innovations: Do Biologics Differ from Small Molecules?," NBER Working Papers 16014, National Bureau of Economic Research, Inc.
    64. DiMasi, Joseph A. & Hansen, Ronald W. & Grabowski, Henry G., 2003. "The price of innovation: new estimates of drug development costs," Journal of Health Economics, Elsevier, vol. 22(2), pages 151-185, March.
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    Cited by:

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    5. Thierry Nianogo & Albert Okunade & Demba Fofana & Weiwei Chen, 2016. "Determinants of US Prescription Drug Utilization using County Level Data," Health Economics, John Wiley & Sons, Ltd., vol. 25(5), pages 606-619, May.
    6. Stacy Sneeringer & Matt Clancy, 2020. "Incentivizing New Veterinary Pharmaceutical Products to Combat Antibiotic Resistance," Applied Economic Perspectives and Policy, John Wiley & Sons, vol. 42(4), pages 653-673, December.

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    More about this item

    Keywords

    Pharmaceutical innovation; Generic entry; Nature of innovation; Innovation policy;
    All these keywords.

    JEL classification:

    • D2 - Microeconomics - - Production and Organizations
    • L5 - Industrial Organization - - Regulation and Industrial Policy
    • L51 - Industrial Organization - - Regulation and Industrial Policy - - - Economics of Regulation
    • L65 - Industrial Organization - - Industry Studies: Manufacturing - - - Chemicals; Rubber; Drugs; Biotechnology; Plastics
    • M2 - Business Administration and Business Economics; Marketing; Accounting; Personnel Economics - - Business Economics

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