I develop a framework for assessing economic warfare, which describes efforts to undermine adversaries' sources of income. The ability to target adversarial market participants is a primary determinant of the success of such efforts, as is the elasticity of demand in the relevant market. An application of the framework to US efforts to suppress the Afghan opium trade yields pessimistic results. Inelastic demand and poorly targeted enforcement have led these efforts to increase the drug trade resources flowing toward the Taliban.

We investigate whether physicians' financial incentives influence health care supply, technology diffusion, and resulting patient outcomes. In 1997, Medicare consolidated the geographic regions across which it adjusts physician payments, generating area-specific price shocks. Areas with higher payment shocks experience significant increases in health care supply. On average, a 2 percent increase in payment rates leads to a 3 percent increase in care provision. Elective procedures such as cataract surgery respond much more strongly than less discretionary services. Non-radiologists expand their provision of MRIs, suggesting effects on technology adoption. We estimate economically small health impacts, albeit with limited precision.