ALTERNATIVE GREEN PAYMENT POLICIES UNDER HETEROGENEITY WHEN MULTIPLE BENEFITS MATTER
研究多种补贴政策对农户采用保护性耕作的环境影响，通过环境洛伦兹曲线比较不同政策目标（耕作方式或环境效益）的效果，并应用于爱荷华州案例，为政策制定者选择最优补贴策略提供依据。
We investigate the environmental impacts of several forms of policies that offer farmers subsides in return for adoption of conservation tillage. The policies differ on whether the tillage practice or one of the environmental benefits is targeted. We develop an environmental Lorenz curve that fully represents the performance of the targeting policies, and we show that these curves can be used directly to help select the optimal targeting strategy for special classes of social welfare functions. We apply the model to the state of Iowa.