In many recent location choice models, households randomly vary with respect to their utility of living in a location. We demonstrate that the distribution generating this randomness is fundamentally not identifiable from location choice data and as a result the optimal allocation as chosen by a...

Cities experience significant, near random walk productivity shocks, yet population is slow to adjust. In practise local population changes are dominated by variation in net migration, and we argue that understanding gross migration is essential to quantify how net migration may slow population...