There is something called commodity

送交者: FatFinger 于 2013-03-16, 06:49:21:

回答: 蓝海，猪肉降了多少？由 whatistruth 于 2013-03-14, 20:47:07:

大户不买保险，不hedge?
If there were no hedging, ailine companies could be totally wiped out in abnornmal time.

The planning systemproosed below is a bad idea.