4E.Mansfield.Microeconomics4th Edition[M].W.W.Nor-ton and Company, 1982:23.
5阚宏,吕殿平.经济学教程[M].北京:经济管理出版社,2001:3.
6RicardL.Kohls, Loseph N.Uhl.Marketing of Agriculturalproducts[M].Prentice-Hall, Inc., 2002: 73-85.
7ThomasJ.G..A Comparative Analysis of AgriculturalTransportation and logistics Systems in the United States andArgentina [J].Analysis of Current Performance by Transporta-tion Mode,2000(8) :14-16.