This study presents a novel empirical approach to identify financing constraints for innovation based on the concept of … they selected additional innovation projects, they must have had some unexploited investment opportunities that were not … profitable using more costly external finance. We attribute constraints for innovation not only to lacking financing, but also to …

external knowledge acquisition are complementary innovation activities, but that the degree of complementarity is sensitive to … existence of complementarity. We use our empirical methodology to analyze complementarity between innovation activities …: internal research and development (R& D) and external knowledge acquisition. Our results suggest that internal R& D and …

Successful innovation depends on the development and integration of new knowledge in the innovation process. In order … to innovate successfully, the firm will combine different innovation activities. In addition to doing own research and … development, firms typically are engaged in the acquisition of knowledge on the technology market and cooperate actively in R …