The diffusion of knowledge in the world generates positive externalities if knowledge flows increase the productivity of R&D. Our work analyzes knowledge diffusion and knowledge externalities in generating innovation and in determining productivity. We first estimate the determinants of...

The revival of international migration in the last fifteen years has spurred economists to more systematically study their determinants and consequences. This contribution expands the existing literature in two directions. First we focus on the European Union as a whole and compare it to the US...

The importance of innovation for the economic performance of industrialized countries has been largely stressed recently by the theoretical and empirical literature. Moreover the intensity of knowledge externalities in generating innovation, is the key parameter in determining sustained growth...