National borders are still strong barriers for mergers and acquisitions in Europe. We estimate a gravity equation model based on NUTS 2-regions and find that the restraining impact of national borders decreased by about a third between 1990 and 2007. However, there has been no significant change...

Immigration policy can have important net fiscal effects that vary by immigrants' skill level. But mainstream methods to estimate these effects are problematic. Methods based on cash-flow accounting offer precision at the cost of bias; methods based on general equilibrium modeling address bias...