International trade in a differentiated good: trade elasticities in the world rice market
采用Armington方法将世界大米贸易建模为差异化商品市场，并推导贸易弹性参数，以纠正以往同质化假设导致的政策误导。
In many previous rice trade models, the commodity has been regarded as a homogeneous product. However, homogeneity is not an appropriate assumption, given the various types of rice that are traded and consumed. Parameters estimated from these models, therefore, do not reflect the real world market for rice and, hence, may mislead decision makers who use the results for policy evaluation purposes. This study uses an Armington approach to model the world rice trade as a differential good market and to derive trade elasticity parameters.