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2007-06-05 | ［五常考室第1期］答案
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转述张五常教授的话如下：
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。
本期答案：
Normative economics concerns what ought to be, involving value judgement. It is not a science because it contains no testable implications—therefore has no explanatory power.
On the other hand, positive economics studies what is. This implies the existence of some theories which contain propositions such as “if A then B”, with the logical consequence of “if not B then not A”. A positive science is regarded as empirical in nature if such propositions or implications are testable, which requires that both A and B are observable entities.
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