嗬嗬，第二步就出現錯誤了。茅於軾經濟學裏就充滿了這種似是而非的所謂“數學”。有興趣的可去看看。

來源: 飛越天險於 2013-09-17 11:25:17 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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