December 31, 2019, Paper, "Have workers stopped moving to the highest-density, highest-productivity places in the country because of a decline in the urban wage premium, or because the rent is too high? We analyze how important these two explanations are by studying them in one and the same empirical analysis. We find that non-college workers now effectively face a housing-inclusive urban wage penalty, while workers with college education continue to face a significant urban wage premium. We relate these findings to the share of native-born cross-state migrants across areas of different density levels, and stumble upon a puzzle: why aren’t more college workers moving to the city?"