Large-scale randomized interventions have the potential to uncover the causal effect of programs applying to a large population, thereby improving on the insights gained from currently dominant smaller randomized studies. However, the external validity gained through larger interventions...

This book addresses the thorny and fascinating question of how food and voucher programs, despite theory and evidence generally favoring cash, remain relevant, have evolved, and, in most circumstances, have improved over time. In doing so, we take an evolutionary and pragmatic view; we are...