作者 Author

H·亨德里克•盖尔

H. Frederick Gale

H·亨德里克·盖尔,供职于美国农业部经济研究局,本文中的观点仅为作者个人看法,并不代表经济研究局或美国农业部

H Frederick Gale works at the Economic Research Service in the US Department of Agriculture. The views expressed in this article are those of the author and may not be attributed to the Economic Research Service or the U.S. Department of Agriculture.