138***262019-05-30 10:11:53

Which of the following statements is the best description of the difference between a Giffen good and a Veblen good? A The Giffen good alone is an inferior good. B The substitution effect for each is in opposite directions. C The Veblen good alone has a positively sloped demand curve. 这道题老师解释说veblen商品斜率是正的，但是强化班讲义里提到它的斜率有可能是负的，请问到底哪种说法是正确的呀，它的斜率可正可负的话是不是不能从斜率来判断吉芬商品和它的不同？