position variables and the potential spilover pool in explaining R&D intensity, patent productivity and TFP growth is explored … effects are significant in explaining patent productivity. I cannot distinguish between the two effects in explaining TFP … firms do more R&D themselves, they produce more patents per R&D dollar, and their productivity grows faster, even …

of capital, and various factor demand functions for the Bell system during the post-war period. Each vintage of capital … is assumed to differ in productivity according to a parametric function of R&D effort embodied in that vintage of capital …&D expenditures at Bell Laboratories and the improvements in the productivity of specific capital inputs which are due to those R …

This paper investigates changes in the output and productivity of research and development activities in Japanese …&D productivity at the firm-level suggest that there has been a slowdown in the growth of Japanese research productivity in the 1990s …

, patented inventions, and total factor productivity) to identify a plausible model of endogenous technological change. In the US … (as well as in other developed countries) research employment and total factor productivity have both grown, while the …

sources of the growth of output, labor productivity, and total factor productivity. The results show that resource …