【单选题】听力原文:W: Mary seems to think that the price will be going up again. M: That's her opinion, most others think differently. W: But sometimes she seems to have a good judgement. M. Oh, really? What does t...
【判断题】If the demand function is q = 3m=p; where m is income and p is price, then the absolute value of the price elasticity of demand decreases as price increases.