This paper briefly reviews the sources of the diversity of innovative activity within industries, and interprets the literature to suggest that there are three ways in which such diversity may stimulate technological progress, including a selection effect, a breadth effect and a complementarity...

This paper proposes a framework for examining factors that affect innovation in sectors: sectoral systems. Sectoral systems are based on three building blocks: knowledge and technologies, actors and networks, and institutions. In the first part of this paper, the concept and the definition of a...

In this paper we present a history-friendly model of the changing vertical scope of computerfirms during the evolution of the computer and semiconductor industries. The model is“history friendly”, in that it attempts at replicating some basic, stylized qualitative features ofthe evolution of...

Do the additionality effects of R&D tax credits vary across sectors? The paper presents a microeconometric analysis of this question for three countries: Norway, Italy and France. We use a panel of firm-level data from three waves of the Innovation Surveys carried out in these countries,...