The longitudinal, 1988-89, LMAS makes it possible to study the interaction between social assistance and labour supply while allowing for substantial time dependence. Tobit equations for hours worked on and off social assistance, which allow for endoge nous selection of social assistance status,...

Experimental evidence on a range of interventions in developing countries is accumulating rapidly. Is it possible to extrapolate from an experimental evidence base to other locations of policy interest (from "reference" to "target" sites)? And which factors determine the accuracy of such an...