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...

Increased rates of mortgage foreclosures in the U.S. have had devastating social and economic impacts during and after the 2008 financial crisis. As part of the response to this problem, nonprofit organizations such as community development corporations (CDCs) have been trying to mitigate the...