当所有事情的机会成本均等时，最好的解决方案是选择那个总时间花费最少的(包括修理和维护的时间)。
All things being equal, the best solution is the one that takes the least amount of total time (including maintenance time for fixing and support).
在第一个方面，它主要讲机会成本的稀缺性与选择，微观经济学和宏观经济学的概念。
In the first sector, it is mainly talking about the conceptions of scarcity and choice, opportunity cost and the micro and macro economics.
从问题1的生产可能性曲线图，解释经济学的稀缺性，选择和增加机会成本的概念。
With reference to the production possibility curve diagram you drew for Question 1B, explain the Economics concepts of scarcity, choice and increasing opportunity costs.
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