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The Unexpected Consequences of Generic Entry

Author

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  • Micael Castanheira De Moura
  • Georges Siotis
  • Carmine Ornaghi

Abstract

Generic drugs are sold at a fraction of the original brand price. Yet, generic entry typically produces a drop in the quantity market share of the molecule losing exclusivity. This effect is economically and statistically significant for a large dataset covering hundreds of prescription drugs sold in the US during the period 1994Q1–2003Q4. This paper proposes the first systematic analysis of what appears to be a market anomaly.We propose a model to characterize the market equilibrium before and after generic entry. We identify precise conditions under which entry reduces the quantity market share of the molecule. Intriguingly, this is more likely to occur when the remaining patent-protected molecules feature low horizontal differentiation. We test this and other theoretical predictions of the model and find they are validated empirically.

Suggested Citation

  • Micael Castanheira De Moura & Georges Siotis & Carmine Ornaghi, 2019. "The Unexpected Consequences of Generic Entry," ULB Institutional Repository 2013/298643, ULB -- Universite Libre de Bruxelles.
  • Handle: RePEc:ulb:ulbeco:2013/298643
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    Cited by:

    1. Herz, Benedikt & Mejer, Malwina, 2020. "The effect of design protection on price and price dispersion: Evidence from automotive spare parts," MPRA Paper 109645, University Library of Munich, Germany, revised 01 Sep 2021.
    2. Sofia Amaral-Garcia, 2020. "Medical Device Companies and Doctors: Do their Interactions Affect Medical Treatments ?," Working Papers ECARES 2020-18, ULB -- Universite Libre de Bruxelles.
    3. Georges Siotis & Carmine Ornaghi & Micael Castanheira De Moura, 2020. "Market Definition and Competition Policy Enforcement in the Pharmaceutical Industry," Working Papers ECARES 2020-49, ULB -- Universite Libre de Bruxelles.
    4. Ziemowit Bednarek & Jacqueline Doremus & Sarah Stith, 2021. "U.S. Cannabis Laws Projected to Cost Generic and Brand Pharmaceutical Firms Billions," Working Papers 2102, California Polytechnic State University, Department of Economics.
    5. Higgins, Matthew J. & Yan, Xin & Chatterjee, Chirantan, 2021. "Unpacking the effects of adverse regulatory events: Evidence from pharmaceutical relabeling," Research Policy, Elsevier, vol. 50(1).
    6. Anton‐Giulio Manganelli, 2021. "Reverse payments, patent strength, and asymmetric information," Health Economics, John Wiley & Sons, Ltd., vol. 30(1), pages 20-35, January.
    7. Castanheira, Micael & Ornaghi, Carmine & Siotis, Georges, 2019. "Market definition in the pharmaceutical industry: a case of drugs hopping antitrust markets?," CEPR Discussion Papers 14035, C.E.P.R. Discussion Papers.
    8. Ilaria Natali & Mathias Dewatripont & Victor Ginsburgh & Michel Goldman & Patrick Legros, 2020. "Prescription Opioids and Economic Hardship in France," Working Papers ECARES 2020-01, ULB -- Universite Libre de Bruxelles.

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    More about this item

    Keywords

    Non-price competition; Pharmaceutical industry; Consumer choice; Generic entry;
    All these keywords.

    JEL classification:

    • D22 - Microeconomics - - Production and Organizations - - - Firm Behavior: Empirical Analysis
    • I11 - Health, Education, and Welfare - - Health - - - Analysis of Health Care Markets
    • L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets

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