In order to study networks of collaboration between researchers, we propose a simple measure of the intensity of collaboration, which can be easily interpreted in terms of relative probability and directly aggregated at the laboratory level. We use it to characterize the relations of...

This paper presents some works realized under the sponsorship of the CNRS research program: The Economics of innovation: trends and issues [1997-2002]. Four topics are emphasized: The macroeconomic and microeconomic representations of the innovative process and the links between innovation,...

The development and spread of information and communication technologies (ICTs) fuelled by the very rapid and steady improvement in their performance, lead to a sustained increase in productivity gains. These productivity gains are likely to increase the potential output growth, in the medium to...