新手一枚,不过早闻人大经济论坛之传奇,故此求一篇外文文献,详情如下:
Cattani, K. D., W. G. Gilland, J. M. Swaminathan. 2004a. Adding a direct channel? How autonomy of the direct channel affects prices and profits. Working Paper. University of North Carolina,Chapel Hill, North Carolina.