When Do More Patents Reduce R&D?
This paper develops a simple duopoly model in which investments in R&D and patents are inputs in the production of firm rents. Patents are necessary to appropriate the returns to the firm’s own R&D, but patents also create potential claims against the rents of rival firms. Analysis of the model reveals a general necessary condition for the existence of a positive correlation between the firm’s R&D intensity and the number of patents it obtains. When that condition is violated, changes in exogenous parameters that induce an increase in firms’ patenting can also induce a decline in R&D intensity. Such a negative relationship is more likely when (1) there is sufficient overlap in firms’ technologies so that each firm’s inventions are likely to infringe the patents of another firm, (2) firms are sufficiently R&D intensive, and (3) patents are cheap relative to both the cost of R&D and the value of final output.
(This abstract was borrowed from another version of this item.)
If 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.
As the access to this document is restricted, you may want to look for a different version under "Related research" (further below) or search for a different version of it.
Volume (Year): 96 (2006)
Issue (Month): 2 (May)
|Contact details of provider:|| Web page: https://www.aeaweb.org/aer/|
More information through EDIRC
|Order Information:||Web: https://www.aeaweb.org/subscribe.html|
References listed on IDEAS
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.:
- Gilbert, R. & Shapiro, C., 1988.
"Optimal Patent Length And Breadth,"
28, Princeton, Woodrow Wilson School - Discussion Paper.
- Robert M. Hunt, 2004.
"Patentability, Industry Structure, and Innovation,"
Journal of Industrial Economics,
Wiley Blackwell, vol. 52(3), pages 401-425, 09.
- Paul Klemperer, 1990.
"How Broad Should the Scope of Patent Protection Be?,"
RAND Journal of Economics,
The RAND Corporation, vol. 21(1), pages 113-130, Spring.
- Klemperer, Paul, 1990. "How Broad Should the Scope of Patent Protection Be?," CEPR Discussion Papers 392, C.E.P.R. Discussion Papers.
- Carl Shapiro, 2003.
"Antitrust Limits to Patent Settlements,"
Law and Economics
- Jay Pil Choi, 2003. "Pools and Cross-Licensing in the Shadow of Patent Litigation," CESifo Working Paper Series 1070, CESifo Group Munich.
- Robert M. Hunt, 1999. "Nonobviousness and the incentive to innovate: an economic analysis of intellectual property reform," Working Papers 99-3, Federal Reserve Bank of Philadelphia.
- James Bessen & Robert M. Hunt, 2004.
"An empirical look at software patents,"
03-17, Federal Reserve Bank of Philadelphia.
- Wesley M Cohen & Richard R Nelson & John P Walsh, 2003.
"Protecting Their Intellectual Assets: Appropriability Conditions and Why U.S. Manufacturing Firms Patent (Or Not),"
Levine's Working Paper Archive
618897000000000624, David K. Levine.
- Wesley M. Cohen & Richard R. Nelson & John P. Walsh, 2000. "Protecting Their Intellectual Assets: Appropriability Conditions and Why U.S. Manufacturing Firms Patent (or Not)," NBER Working Papers 7552, National Bureau of Economic Research, Inc.
- Robert M. Hunt, 2006.
"When do more patents reduce R&D?,"
06-6, Federal Reserve Bank of Philadelphia.
- Reinganum, Jennifer R., .
"Innovation and Industry Evolution,"
426, California Institute of Technology, Division of the Humanities and Social Sciences.
- Bronwyn H. Hall, 2004.
"Exploring the Patent Explosion,"
NBER Working Papers
10605, National Bureau of Economic Research, Inc.
- Bronwyn Hall, 2004. "Exploring the patent explosion," ESRC Centre for Business Research - Working Papers wp291, ESRC Centre for Business Research.
- Shapiro, Carl, 2000.
"Navigating the Patent Thicket: Cross Licenses, Patent Pools, and Standard-Setting,"
Competition Policy Center, Working Paper Series
qt4hs5s9wk, Competition Policy Center, Institute for Business and Economic Research, UC Berkeley.
- Carl Shapiro, 2001. "Navigating the Patent Thicket: Cross Licenses, Patent Pools, and Standard Setting," NBER Chapters, in: Innovation Policy and the Economy, Volume 1, pages 119-150 National Bureau of Economic Research, Inc.
- Carl Shapiro, 2003. "Navigating the Patent Thicket: Cross Licenses, Patent Pools, and Standard-Setting," Law and Economics 0303005, EconWPA.
- Carl Shapiro, 2004. "Navigating the Patent Thicket: Cross Licenses, Patent Pools and Standard Setting," Levine's Working Paper Archive 122247000000000539, David K. Levine.
- Rosemarie Ham Ziedonis, 2004. "Don't Fence Me In: Fragmented Markets for Technology and the Patent Acquisition Strategies of Firms," Management Science, INFORMS, vol. 50(6), pages 804-820, June.
- Lee, Tom & Wilde, Louis L, 1980. "Market Structure and Innovation: A Reformulation," The Quarterly Journal of Economics, MIT Press, vol. 94(2), pages 429-36, March.
- Joseph Farrell & Carl Shapiro, 2008.
"How Strong Are Weak Patents?,"
American Economic Review,
American Economic Association, vol. 98(4), pages 1347-69, September.
- James Bessen, 2004. "Patent Thickets: Strategic Patenting of Complex Technologies," Working Papers 0401, Research on Innovation.
- Adam B. Jaffe & Josh Lerner & Scott Stern, 2007. "Innovation Policy and the Economy, Volume 7," NBER Books, National Bureau of Economic Research, Inc, number jaff07-1, September.
When requesting a correction, please mention this item's handle: RePEc:aea:aecrev:v:96:y:2006:i:2:p:87-91. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Jane Voros)or (Michael P. Albert)
If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.
If references are entirely missing, you can add them using this form.
If the full references list an item that is present in RePEc, but the system did not link to it, you can help with this form.
If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your profile, as there may be some citations waiting for confirmation.
Please note that corrections may take a couple of weeks to filter through the various RePEc services.