This paper examines the interactive effect of distance and trade on international conflict and cooperation. The effect of geographic distance depends on trade, while the effect of trade varies with geographic distance. Trade reduces conflict to a greater extent when dyads are geographically...

We extend prior research on the effect of managed care on the receipt of four medical interventions for pregnant women: ultrasound, induction/stimulation of birth, electronic fetal monitor, and cesarean delivery. Propensity score methods are used to account for sample selection issues regarding...