Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
We explore the first period of sustained decline in child mortality in the United States and provide estimates of the independent and combined effects of clean water and effective sewerage systems on under-5 mortality. Our case is Massachusetts, 1880–1920, when authorities developed a sewerage and water district in the Boston area. We find the two interventions were complementary and together account for approximately one-third of the decline in log child mortality during the 41 years. Our findings are relevant to the developing world and suggest that a piecemeal approach to infrastructure investments is unlikely to significantly improve child health.