NBER Publications by Karen Clay

Beginning around 1880, public health issues and engineering advances spurred the installation of city water and sewer systems. As part of this growth, many cities chose to use lead service pipes to connect residences to city water systems. This choice had negative consequences for child mortality, although the consequences were often hard to observe amid the overall falling death rates. This paper uses national data from the public use sample of the 1900 Census of Population and data on city use of lead pipes in 1897 to estimate the effect of lead pipes on child mortality. In 1900, 29 percent of the married women in the United States who had given birth to at least one child and were age forty-five or younger lived in locations where lead service pipes were used to deliver water. Beca...

This paper explores how early life exposure to poverty and want adversely affects later life health outcomes. In particular, it examines how exposure to crowded housing conditions and impure drinking water undermines long-term health prospects and increases the risk of age-related pathologies such as cancer, heart disease, kidney disease, and stroke. Exploiting city-level data from early-twentieth century America, evidence is presented that cities with unusually high rates of typhoid fever in 1900 had elevated rates of heart and kidney disease fifteen years later; also cities with unusually high rates of tuberculosis in 1900 had elevated rates of cancer and stroke fifteen years later. The estimated coefficients suggest that eradicating typhoid fever (through water purification) and tuber...