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The Rate of Obsolescence of Knowledge, Research Gestation Labs, and the Private Rate of Return to Research Resources

Listed author(s):
  • Pakes, Ariel
  • Schankerman, Mark A.

This paper points out the conceptual distinction between the rates of decay in the physical productivity of traditional capital goods and that of the appropriate revenues accruing to knowledge-producing activities, and notes that it is the latter parameter which is required in any study which constructs a stock of privately marketable knowledge. The rate of obsolescence of knowledge is estimated from a simple patent renewal and the estimates are found to be comparable to evidence provided by firms on the lifespan of the output of their R&D activities. These estimates, together with mean R&D gestation lags, are then used to correct previous estimates of the private excess rate of return to investment in research. We find that after the correction, the private excess rate of return to investment in research, at least in the early 1960's, was close to zero, which may explain why firms reduced the fraction of their resources allocated to research over the subsequent decade.

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File URL: http://econ.as.nyu.edu/docs/IO/9405/RR78-13.pdf
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Paper provided by C.V. Starr Center for Applied Economics, New York University in its series Working Papers with number 78-13.

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Length: 34 pages
Date of creation: 1978
Handle: RePEc:cvs:starer:78-13
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C.V. Starr Center, Department of Economics, New York University, 19 W. 4th Street, 6th Floor, New York, NY 10012

Phone: (212) 998-8936
Fax: (212) 995-3932
Web page: http://econ.as.nyu.edu/object/econ.cvstarr.html
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Order Information: Postal: C.V. Starr Center, Department of Economics, New York University, 19 W. 4th Street, 6th Floor, New York, NY 10012
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  1. Kenneth Arrow, 1962. "Economic Welfare and the Allocation of Resources for Invention," NBER Chapters,in: The Rate and Direction of Inventive Activity: Economic and Social Factors, pages 609-626 National Bureau of Economic Research, Inc.
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