NO.PZ2016121201000002
问题如下:
When income elasticity is negative, the good should be classified as
选项:
A.an inferior good.
B.an normal good.
C.luxuries.
解释:
A is correct.
The income elasticity of an inferior good is negative.
弹性不是都是负的麻,我选了normal good,这题考点和答案分别是什么意思呢,谢谢老师