Uncertainty varies strongly over time, rising by 50% to 100% in recessions and by up to 200% after major economic and political shocks. This paper shows that higher uncertainty reduces the responsiveness of R&D to changes in business conditions - a "caution-effect" - making it more persistent...

Convergence in per capita income across countries turns on whether technological knowledge spillovers are global or local in a large class of models. This Paper estimates the amount of spillovers from R&D expenditures in major industrialized countries on a geographic basis. A new data set is...

Earlier studies of spillovers from international research and development (R&D) suggest how economies benefit from R&D conducted abroad. To the extent that countries importing new technologies do not pay in full for the increased variety in intermediate inputs in production, they are reaping an...