http://www.etf.com/sections/blog/5362-uso-oil-usl.html
Don't know if it is applicable to the current situation. But we can learn how USO works from the example.
It is saild USL is better than USO.
本文内容已被 [ huntridge ] 在 2015-01-13 08:56:57 编辑过。如有问题,请报告版主或论坛管理删除.