A heated debate in drug policy concerns the relative merits of "harm reduction" (e.g., reducing drug-related HIV/AIDS transmission) vs. "use reduction" (controlling drug use per se). This paper models whether shifting emphasis between these goals over the course of a drug epidemic might reduce...

We present a novel model of corruption dynamics in the form of a nonlinear optimal dynamic control problem. It has a tipping point, but one whose origins and character are distinct from that in the classic Schelling (1978) model. The decision maker choosing a level of corruption is the chief or...