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Measuring the Social Return to R&D

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  • Charles I. Jones
  • John C. Williams

Abstract

January 24, 1997, Version 2.00 Is there too much or too little private research and development (R&D)? A large empirical literature reports estimates of the rate of return to R&D ranging from 30% to over 100%, supporting the notion that there is too little private investment in research. However, this conclusion is challenged by the new growth theory, which emphasizes a richer description of the connection between R&D and productivity. In this paper we bridge the gap between the theoretical and empirical literatures. Using the framework of an R&D-based growth model, we derive analytically the relationship between the social rate of return to R&D and the coefficient estimates of the empirical literature. Somewhat surprisingly, we show that these estimates represent a lower bound on the true social rate of return. Furthermore, our analytic framework provides a direct mapping from the rate of return to the degree of underinvestment in research. Using a conservative estimate of the rate of return to R&D of about 30%, optimal R&D investment is at least four times larger than actual investment. This is a substantially revised version of an earlier paper, "Too Much of a Good Thing? The Economics of Investment in R&D"

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  • Charles I. Jones & John C. Williams, "undated". "Measuring the Social Return to R&D," Working Papers 97002, Stanford University, Department of Economics.
  • Handle: RePEc:wop:stanec:97002
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