回复：回复：加倍下注的陷阱-DXO

来源: 于 2009-02-08 13:26:04 [旧帖] [给我悄悄话] 本文已被阅读：次

Hi,

What if to use double ETFs ,for example QLD/QID as pair to build a portolio ? Of course it is hard to determine the ratio between the two.


Thanks !