In Search of the Armington Elasticity
研究了不同国家商品之间的替代弹性（阿明顿弹性），发现大部分商品的宏观与微观弹性无显著差异，但部分商品的微观弹性明显更高。
How big is the elasticity of substitution between goods from different countries—the Armington elasticity? Estimates of the macroelasticity between home and imported goods are often smaller than the microelasticity between foreign sources of imports. Using new, highly disaggregate U.S. production data matched to imports and simulated data from a Melitz-style model with nested CES preferences, we explore estimation techniques for the two elasticities. For between two-thirds and three-quarters of sample goods, there is no significant difference between the macro- and microelasticities, but for the rest, the microelasticity is significantly higher, even at the same level of disaggregation.