Date Added: Nov 2009
The authors examine the impact of internal and external R&D on labor productivity in a 6-year panel of Dutch manufacturing firms. They apply a dynamic linear panel data model that allows for decreasing or increasing returns to scale in internal and external R&D and for economies of scope. They find complementarity between internal and external R&D, with a positive impact of external R&D only evident in case of sufficient internal R&D. These findings confirm the role of internal R&D in enhancing absorptive capacity and hence the effective utilization of external knowledge.