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Strategic Entry Deterrence and the Behavior of Pharmaceutical Incumbents Prior to Patent Expiration

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Author Info
Glenn Ellison
Sara Fisher Ellison

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Abstract

This paper develops a new approach to testing for strategic entry deterrence and applies it to the behavior of pharmaceutical incumbents just before they lose patent protection. The approach involves looking at a cross-section of markets and examining whether behavior is nonmonotonic in the size of the market. Under certain conditions, investment levels will be monotone in market size if firms are not influenced by a desire to deter entry. Strategic investments, however, may be nonmonotone because entry deterrence is unnecessary in very small markets and impossible in very large ones, resulting in overall nonmonotonic investment. The pharmaceutical data contain advertising, product proliferation, and pricing information for a sample of drugs which lost patent protection between 1986 and 1992. Among the findings consistent with an entry deterrence motivation are that incumbents in markets of intermediate size have lower levels of advertising and are more likely to reduce advertising immediately prior to patent expiration.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 13069.

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Date of creation: Apr 2007
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Handle: RePEc:nbr:nberwo:13069

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Find related papers by JEL classification:
L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets
L65 - Industrial Organization - - Industry Studies: Manufacturing - - - Chemicals; Rubber; Drugs; Biotechnology

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Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Alka Chadha & Åke Blomqvist, 2005. "Patent Races, “Me-Too” Drugs, and Generics: A Developing-World Perspective," Departmental Working Papers wp0513, National University of Singapore, Department of Economics. [Downloadable!]
  2. Leemore S. Dafny, 2003. "Entry Deterrence in Hospital Procedure Markets: A Simple Model of Learning-By-Doing," NBER Working Papers 9871, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  3. Sara Fisher Ellison & Catherine Wolfram, 2001. "Pharmaceutical Prices and Political Activity," NBER Working Papers 8482, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  4. Sara Fisher Ellison & Catherine Wolfram, 2004. "Coordinating on Lower Prices: Pharmaceutical Pricing Under Political Pressure," Economics Working Papers 0048, Institute for Advanced Study, School of Social Science. [Downloadable!]
  5. Murat F. Iyigun & X. Maggie Chen, 2004. "Strategic R&D Delays Generate Market Power," Econometric Society 2004 North American Summer Meetings 213, Econometric Society. [Downloadable!]
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