We investigate the existence of local (i.e. within-country) and global (i.e. between-country) knowledge spillovers within a single analytical framework. Our analysis is based on an exhaustive database on Irish manufacturing plants covering the period 1986-1994 and focuses on the impact of R&D...

The relationship between growth and pollution is studied through a vintage capital model, where new technologies are more environmentally friendly. We ¯nd that once the optimal scrapping age of technologies is reached, an economy may achieve two possible cases of sustainable development, one in...