本期答案：
There is no logical flaw at all to say in a one-man world Giffen good exists, in the sense that an inferior good may exist to the point where the indifference curves of an individual bear the characteristics of a Giffen good. There is no market price in a one-man world, but relative opportunity costs or constraint changes may in logic lead to a Giffen good result. The same may be said of an individual in society who chooses not to participate in the market.
However, for a good that is actually transacted in the market, a Giffen good cannot logically exist because someone will bid the price so high that the good will not be traded in the market.
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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。
