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2007-06-26 | ［五常考室第3期］答案
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本期答案：
Rent is a cost in that it is an opportunity forgone if outright sale is considered, or if a change in use is considered. Income is a cost because the highest-valued option forgone is typically the same income. Interest is a cost because it is the whole of income. Profit is not cost because it is windfall, totally unanticipated and therefore cannot be counted as an option forgone.
本博客管理员：
请各位同学根据公布的答案给自己客观地打分，不必在此公布，做到心里有数就可以了。以10分为满分，5分为合格，7分为良好，9分为优秀。以后做完100条题目之后，如果平均分可达6分，即达到张五常教授硕士时的水平；如果平均分可达8分，即达到张五常教授博士时的水平。
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