Lokshin, Boris; Belderbos, Rene; Carree, Martin - Institute of Economic Research, Hitotsubashi University - 2006
We examine the impact of internal and external R&D on labor productivity in a 6-year panel of 304 innovating firms. We apply a dynamic linear panel data model that allows for decreasing returns to scale in internal and external R&D with a non-linear approximation of changes in the knowledge...