economic downturn) translates into changes in the poverty rate. Ravallion (2001) shows that, on average, the elasticity of the $1 a day headcount poverty rate to economic growth is about -2. However, looking beyond the average, one can see that the efficiency of growth in reducing poverty varies a lot from one country to another. Using panel data across Indian states, Datt and Ravallion (2002) show that the elasticity of the $1 a day headcount poverty rate is around -1 and probably less (in absolute value) than that for the 1958–91 period. Ravallion (1997) shows