An Economic Model of Soil Conservation
通过将土壤深度和土壤流失引入农业生产模型，分析私人侵蚀路径与社会最优路径的差异，并指出在多数制度安排下两者相同，公共政策应仅针对导致严重污染外部性的侵蚀。
Abstract By introducing soil depth and soil loss into a simple model of agricultural production, this paper seeks to determine when the private path of erosion differs from the socially optimal path. Considering the depletion of soil only and abstracting from the environmental disruption caused by erosion, the paper argues that under most institutional arrangements the social and private rates of erosion are the same. The paper concludes that public policy should be directed toward reducing erosion only when it leads to significant pollution externalities.