Evaluating Marginal Policy Changes and the Average Effect of Treatment for Individuals at the Margin
开发了评估边际政策变化的方法，揭示了边际政策效应与边际个体平均处理效应之间的联系，并应用于估计学费边际变化对大学回报的影响。
This paper develops methods for evaluating marginal policy changes. We characterize how the effects of marginal policy changes depend on the direction of the policy change, and show that marginal policy effects are fundamentally easier to identify and to estimate than conventional treatment parameters. We develop the connection between marginal policy effects and the average effect of treatment for persons on the margin of indifference between participation in treatment and nonparticipation, and use this connection to analyze both parameters. We apply our analysis to estimate the effect of marginal changes in tuition on the return to going to college.