代數和微積分。初等經濟學裏常見的是取對數再取導數，這樣就得到dx/x，就是增長率。

來源: 大觀園的賈探春於 2025-01-16 20:30:05 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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