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 …

regulations, the resulting decision by a polluting firm to upgrade its capital stock, and the impact of innovation on this … in innovation on the polluting firm's steady-state capital stock. Fourth, they analyze the impact of an anticipated … increase in innovation on the polluting firm's steady-state capital stock. Finally, the authors discuss the relationship …

. In the deterministic model, R&D in time t surely leads to an innovation in time t + 1. In this setting, the authors show … hence achieves a larger size of innovation and a higher growth rate. Next, in the stochastic model, R&D in time t … probabilistically leads to an innovation in time t + 1. In this setting, the authors first define the equilibrium and the steady state …