For Want of a Cup: The Rise of Tea in England and the Impact of Water Quality on Mortality
利用18世纪英国饮茶兴起这一自然实验，发现饮茶导致无意中增加开水消费，从而降低死亡率，尤其在水质较差的地区效果更显著。
Abstract This paper explores the impact of water quality on mortality by exploiting a natural experiment: the rise of tea consumption in eighteenth century England. This resulted in an unintentional increase in consumption of boiled water, thereby reducing mortality rates. The methodology uses two identification strategies tying areas with lower initial water quality to larger declines in mortality rates after tea drinking became widespread and following larger volumes of tea imports. Results are robust to the inclusion of controls for income and access to trade. The hypothesis is further bolstered by suggestive evidence from cause specific deaths and early childhood mortality.