一位经济学教授在给学生授课时曾说,“成本就是你所放弃的东西。”用户也许会这样理解:当我买得一台工程机械因为种种原因不再想用时,我付出的成本从此将会沉没。而二手设备商则对成本有着不同的理解:成本不会沉没,关键看你如何打捞。 An economics professor once taught students that “cost is something you give up.” The user might understand this: When I bought a construction machine for a variety of reasons I no longer wanted it, the cost I paid Will sink. The second-hand equipment vendors have a different understanding of the cost: the cost will not sink, the key to see how you salvage.