Identification and measurement of health-related spillovers in impact evaluations
3ie Systematic Review Summary 3, 2016
This systematic review summary by Benjamin-Chung et al. tries to identify mechanisms that trigger spillover through geographic or social proximity, learning or imitation, norm-shaping, income and substitute effects, general equilibrium effects and relative deprivation. The review finds clear evidence of the benefits of vaccination spilling over to non-recipients. For other interventions around mass drug administration, health education, cash transfers, insecticide-treated bednets, and water and sanitation, there is very limited evidence available to allow for generalisability of findings.