本益比

June 29, 2009

人類行為的每個層面多少都牽涉到成本的權衡
某個事物的成本降低時，它的吸引力就跟著提升

那是因為這能獲得最大的效用

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Ｍｒ．江，的心情 本益比

本益比

Ｍｒ．江，的心情本益比