COMPARATIVE ADVANTAGES AND CROP DIVERSIFICATION: A POLICY ANALYSIS MATRIX FOR THAI AGRICULTURE
用政策分析矩阵评估1994-96年泰国农业多样化政策的成本收益，发现水稻比大豆和绿豆更有利可图，政府干预可能带来效率损失，但价格变化、水资源短缺和环境效应可能为干预提供理由。
This study aims to assess the costs and benefits of the Thai agricultural diversification policy in 1994–96. Three competitive crops (rice, soybeans and mungbeans) are selected in two provinces to study their comparative advantages in terms of a policy analysis matrix. The results suggest that rice is more profitable than soybeans and mungbeans, implying that government intervention may incur efficiency losses. Some sensitivity analyses, however, suggest that potential price changes, increasing water scarcity, and the effects of crop production on the environment are important concerns which may justify government intervention.