
- UID
- 222243
- 帖子
- 265
- 主题
- 127
- 注册时间
- 2011-7-2
- 最后登录
- 2013-8-20
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uh,
if you think that way then taking it in the first place was a waste.
if its worth it take once, then its worth it to take it twice. you don't all of a sudden get to negative utility (or npv) by taking it a second time. |
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