This paper evaluates the impact of R&D investment on income convergence for a cross section of manufacturing industries in 12 OECD countries over the time period 1987-1999. We apply dynamic panel estimation techniques to obtain a speed of convergence which, when conditioned to R&D expenditure,...

On windy days, Denmark tends to export electricity to its neighbours, and to import power on calm days. Storing electricity in this way thus allows the country to deal with the intermittency of wind generation. We show that this kind of behaviour is theoretically optimal when a region with wind...