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Unlike most costs discussed in economics, an opportunity cost doesn't necessarily involve money. The opportunity cost of any action is simply the next best alternative to that action: What you would have done if you didn't make the choice that you made? 与经济学中讨论的大多数成本不同，机会成本并不一定涉及金钱。任何行动的机会成本都只是该行动的次优方案：如果你没有做出这个选择，你会怎么做？ The notion of opportunity cost is critical to the idea that the true cost of anything is the sum of all the things that you have to give up. 所谓机会成本，其实说的是你必须为之放弃的一切以及所要付出的代价。 Opportunity cost considers only the next best alternative to an action, not the entire set of alternatives, and takes into account all of the differences between the two choices. 机会成本只考虑行动的下一个最佳选择，而不是全部备选方案，并且要考虑到两个选择之间的所有差异。 | 
