possibility that without tight restrictions on migration, migrants from poor countries could transmit low productivity ("A" or … embodied in migrants; assimilation, the degree to which migrants' productivity determinants become like natives' over time in … Total Factor Productivity) to rich countries – offsetting efficiency gains from the spatial reallocation of labor from low …

survival. These effects are stronger for small, skill-intensive, and high-productivity firms that participate in the lottery …

We investigate the relationship between migration and productivity in the UK, using an instrumental variable along the … lines suggested by Bianchi, Buonanno and Pinotti (2012). Our results suggest that immigration has a positive and significant … impact (in both the statistical sense and more broadly) on productivity, as measured at a geographical level; this appears to …