Changing agricultural comparative advantage
针对农业部门特殊性限制了比较优势应用的问题，本文扩展了贸易模型，提出一个三要素模型，分析经济条件变化下农业比较优势的形成，并探讨对项目评估的启示。
Special circumstances in the agricultural sector have limited the use of comparative advantage in addressing the planner's dilemma of allocating investment between industry and agriculture and in examining the doctrine of food selfsufficiency. A three-factor model of agricultural trade, extending earlier models, is used to address some of these special circumstances and to formulate a theory of agricultural comparative advantage under changing economic conditions. Emphasis is placed on the short-run fixity of sector-specific capital stocks, the role of qualitative differences in land (natural resource) endowments, and on non-homothetic preferences. In addition to insights on agricultural comparative advantage, implications for project evaluation are considered.