In this paper we estimate the effect of the Mexican conditional cash transfer program, Oportunidades, on consumption, and we explore some issues related to participation in the program and to the estimation of treatment effects. We discuss the comparability of treatment and control areas,...

I investigate the effect of US border enforcement on the net flow of Mexican undocumented migration, both of which have been considerably increasing in the last 3 decades. This effect is theoretically ambiguous, as increases in border controls deter prospective migrants from crossing the border...