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Research Productivity and Patent Quality: Measurement with Multiple Indicators

47 Pages Posted: 11 Jul 2008  

Jean O. Lanjouw

University of California, Berkeley, College of Natural Resources, Department of Agricultural & Resource Economics (Deceased); Yale University, Faculty of Arts & Sciences, Department of Economics (Deceased); Brookings Institution (Deceased)

Mark A. Schankerman

London School of Economics and Political Science; Centre for Economic Policy Research (CEPR)

Date Written: December 2002

Abstract

We analyse the determinants of the decline in measured research productivity (the patent/R&D ratio)using panel data on manufacturing firms in the U.S. for the period 1980-93. We focus on three factors: the level of demand, the quality of patents, and technological exhaustion. We first develop an index of patent 'quality' using detailed information on patents in the U.S. in seven technology fields. Using a factor model, we construct a minimum-variance index based on four patent characteristics and show that using multiple indicators substantially reduces the measured variance in quality. We then show that research productivity at the firm level is negatively related to the patent quality index and the level of demand, as predicted by an optimizing model of R&D, and positively related to the stock market valuation of patented innovations held by firms.

Suggested Citation

Lanjouw, Jean O. and Schankerman, Mark A., Research Productivity and Patent Quality: Measurement with Multiple Indicators (December 2002). LSE STICERD Research Paper No. EI32. Available at SSRN: https://ssrn.com/abstract=1158309

Jean Olson Lanjouw (Contact Author)

University of California, Berkeley, College of Natural Resources, Department of Agricultural & Resource Economics (Deceased)

Yale University, Faculty of Arts & Sciences, Department of Economics (Deceased) ( email )

28 Hillhouse Ave
New Haven, CT 06520-8264
United States
203-432-3568 (Phone)
203-432-6323 (Fax)

Brookings Institution (Deceased)

Mark A. Schankerman

London School of Economics and Political Science ( email )

Houghton Street
London WC2A 2AE
United Kingdom
+44 20 7955 7518 (Phone)
+44 20 7831 1840 (Fax)

Centre for Economic Policy Research (CEPR) ( email )

77 Bastwick Street
London, EC1V 3PZ
United Kingdom

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