A health example of Opportunity cost -- a humor version.

来源: R.Ling 于 2009-06-10 00:33:29 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (97 bytes)
回答: 我都是用袖子擦的 由 -乱乱乱- 于 2009-06-09 23:51:18

Opportunity cost, by the way, was the first economic concept taught when I studied this subject.

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