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Identification and measurement of health-related spillovers in impact evaluations
3ie Systematic review summary 3
Jade Benjamin-Chung, Diana Tran, Jaynal Abedin, Benjamin F Arnold, David Berger, Alan Hubbard, Ashley Clark, Stephen P. Luby, Lauren Falcao, Edward Miguel, Veronica Jimenez, John M. Colford and Eugene Konagaya
This systematic review summary by Benjamin-Chung and colleagues 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.