This document discusses the relationship between health and economic development. It begins with definitions of health and economic development from WHO and UN sources. It then examines factors that determine health and economic development according to WHO. Several studies are summarized that show the bidirectional relationship between improvements in health outcomes and economic growth. Preston's 1975 analysis found a curvilinear association between income and life expectancy. Barro's 1997 analysis projected that a 10% increase in life expectancy could lead to a 0.4% rise in economic growth. Bloom and Canning's 2000 study analyzed how better health impacts productivity, education, investment and demographics to stimulate economic development. The document concludes by considering whether healthier populations or greater wealth leads to improvements in the other.