In this paper I evaluate the contribution of R&D investments to productivity growth. The basis for the analysis are the free entry condition and the fact that most R&D innovations are embodied. Free entry yields a relationship between the resources devoted to R&D and the growth rate of technology. Since innovators are small, this relationship is not directly affected by the size of R&D externalities, or the presence of aggregate diminishing returns in R&D after controlling for the growth rate of output and the interest rate. The embodiment of R&D-driven innovations bounds the size of the production externalities. The resulting contribution of R&D to productivity growth in the US is smaller than three to five tenths of one percentage point. This constitutes an upper bound for the case where innovators internalize the consequences of their R&D investments on the cost of conducting future innovations. From a normative perspective, this analysis implies that, if the innovation technology takes the form assumed in the literature, the actual US R&D intensity may be the socially optimal.
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Length: Date of creation: Jul 2004 Date of revision: Handle: RePEc:nbr:nberwo:10625
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Find related papers by JEL classification: O40 - Economic Development, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - General E10 - Macroeconomics and Monetary Economics - - General Aggregative Models - - - General
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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.)
Patrick Francois & Huw Lloyd-Ellis, 2005.
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Other versions:
Patrick Francois & Huw Lloyd- Ellis, 2005.
"I - Q Cycles,"
Macroeconomics
0511023, EconWPA.
[Downloadable!]
William Maloney & Andrés Rodríguez-Clare, 2005.
"Innovation Shortfalls,"
RES Working Papers
4429, Inter-American Development Bank, Research Department.
[Downloadable!]
Charles I. Jones, 2004.
"Growth and Ideas,"
NBER Working Papers
10767, National Bureau of Economic Research, Inc.
[Downloadable!] (restricted)
Other versions:
Jones, Charles I., 2005.
"Growth and Ideas,"
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in: Philippe Aghion & Steven Durlauf (ed.), Handbook of Economic Growth, edition 1, volume 1, chapter 16, pages 1063-1111
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[Downloadable!] (restricted)