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Is public R&D spending complementary and thus "additional" to private R&D spending, or does it substitute for and tend to "crowd out" private R&D? Conflicting answers are given to this question. We survey the body of available economectric evidence accumulated over the past 35 years. A framework...
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The identification of age, cohort (vintage), and period (year) effects in a panel of individuals or other units is an old problem in the social sciences, but one that has not been much studied in the context of measuring researcher productivity. In the context of a semi-parametric model of...
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Distribution of Rewards from Innovation', Journal of Evolutionary Economics, 10 (1-2), January, 175-200 -- Paula E. Stephan (1996 …-306 -- Wesley M. Cohen and Daniel A. Levinthal (1989), 'Innovation and Learning: The Two Faces of R&D', Economic Journal, 99 (397 … Economics of Innovation and Technological Change, Chapter 6, Oxford, UK: Blackwell Publishers, 182-264 -- Philippe Aghion, Nick …
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We review the econometric literature on measuring the returns to R&D. The theoretical frameworks that have been used are outlined, followed by an extensive discussion of measurement and econometric issues that arise when estimating the models. We then provide a series of tables summarizing the...
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