Patent protection, creative destruction, and generic entry in pharmaceuticals: Evidence from patent and pricing data
AbstractThis paper merges patent citation data with data on pharmaceutical patent expirations, generic entry, and pricing to explore the effects of observable patent characteristics on off-patent and on-patnet pharmaceutical pricing. Using a sample of drug patents facing generic entry in the 1990s, I find that the price of branded drugs increased on average in the face of generic entry. Importantly, I find that the number of patent citations that a drug receives from other firms is correlated with a decrease in markup and a decrease in the duration of the markup. Conversely, self-citations are correlated with higher prices and slower decay in prices. The results indicate that patent citations may signal the degree of inter-molecule substitution. And, importantly, self-citations may indicate a degree of cumulative patenting that enables a firm to effectively extend or strengthen the original patent protection. This research takes a step forward in understanding the distinction between “positive” citations and “negative” citations related to creative destruction.
Download InfoIf you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large.
Bibliographic InfoPaper provided by Vassar College Department of Economics in its series Vassar College Department of Economics Working Paper Series with number 83.
Date of creation: Nov 2006
Date of revision:
Contact details of provider:
Postal: Maildrop 708, 124 Raymond Avenue, Poughkeepsie NY 12604-0708
Web page: http://irving.vassar.edu/VCEWP/VCEWP.htm
More information through EDIRC
This paper has been announced in the following NEP Reports:
- NEP-ALL-2007-01-13 (All new papers)
- NEP-COM-2007-01-13 (Industrial Competition)
- NEP-ENT-2007-01-13 (Entrepreneurship)
- NEP-INO-2007-01-13 (Innovation)
- NEP-IPR-2007-01-13 (Intellectual Property Rights)
- NEP-TID-2007-01-13 (Technology & Industrial Dynamics)
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.:
- Caroline Hussler, 2004. "Culture and knowledge spillovers in Europe: New perspectives for innovation and convergence policies?," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 13(6), pages 523-541.
- Hall, B. & Jaffe, A. & Trajtenberg, M., 2001.
"The NBER Patent Citations Data File: Lessons, Insights and Methodological Tools,"
2001-29, Tel Aviv.
- Hall, Bronwyn H & Jaffe, Adam B & Trajtenberg, Manuel, 2001. "The NBER Patent Citations Data File: Lessons, Insights and Methodological Tools," CEPR Discussion Papers 3094, C.E.P.R. Discussion Papers.
- Bronwyn H. Hall & Adam B. Jaffe & Manuel Trajtenberg, 2001. "The NBER Patent Citation Data File: Lessons, Insights and Methodological Tools," NBER Working Papers 8498, National Bureau of Economic Research, Inc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Sean Flynn) The email address of this maintainer does not seem to be valid anymore. Please ask Sean Flynn to update the entry or send us the correct address.
If references are entirely missing, you can add them using this form.