The extent to which global financial markets influence health by way of its social determinants is a neglected area of research. This chapter first describes the “implicit conditionalities” associated with the operation of those markets, and how they limit the policy options available to governments. It then explores two destructive dimensions of the hypermobility of capital: financial crises created by the rapid outflow of foreign investment, and capital flight on the part of domestic elites seeking higher returns, lower risks, and often the opportunity to avoid taxation. The financial crisis that spread across the world in 2008 is identified as underscoring the dangers of economic interconnectedness, imposing as it did major costs on those who had no role in creating the crisis. Evidence linking financial crises with health outcomes is briefly reviewed, and a concluding section explores policy implications.