"Tracking socio-economic mobility and inequality across space and time, and building an understanding of where, how, and for whom observed differences have occurred, is both important and challenging. This extensive NBER conference volume by Raj Chetty and four-co-editors – featuring contributions by many of the world’s leading researchers of income and wealth distributions – is a collection of carefully executed empirical studies that do exactly that, drawing on a wealth of data across countries in the developed world."