We don’t know much about economic mobility in developing countries compared to

the wealthier, data-rich societies which have been the subjects of so much recent

research. What does the data tell us so far, and what is important to find out? Debraj

Ray and Garance Genicot tell Tim Phillips why measuring upward mobility in low-

and middle-income countries is both difficult and important, and what their research

is revealing about the impact of growth on that mobility.