问题如下图：
选项：
A. 
B. 
C. 
替代效应我觉得也是负的，请在这方面详细说明下，谢谢。 解释：
NO.PZ2016010801000016 问题如下 When there is a crease in the priof gooX, anthe consumption of gooX also creases, whiof the following statements about the substitution effeanthe income effeis most accurate? A.Both the substitution effeanthe income effeare positive. B.Both the substitution effeanthe income effeare negative. C.The substitution effeis positive anthe income effeis negative. C is correct.If X’s priis creasing, the substitution effewill lea consumer to consume more of X anconsume less substitution of X, whiremains the previous price. The substitution effeis positive. In this question, consumption of X is creasing well, therefore, income effehto negative anlarger thsubstitution effect. 考点替代效应和收入效应。解析无论什么商品，它的替代效应总是正的，所以A不正确。但是X的价格下降后，需求量出现下降，可见，其收入效应表现为负效应，所以B错误。C正确。 解析中“无论什么商品，它的替代效应总是正的”。以吉芬商品为例，收入效应是负的，而且替代效应小于收入效应，为什么说所有商品的替代效应总是正的？
NO.PZ2016010801000016 问题如下 When there is a crease in the priof gooX, anthe consumption of gooX also creases, whiof the following statements about the substitution effeanthe income effeis most accurate? A.Both the substitution effeanthe income effeare positive. B.Both the substitution effeanthe income effeare negative. C.The substitution effeis positive anthe income effeis negative. C is correct.If X’s priis creasing, the substitution effewill lea consumer to consume more of X anconsume less substitution of X, whiremains the previous price. The substitution effeis positive. In this question, consumption of X is creasing well, therefore, income effehto negative anlarger thsubstitution effect. 考点替代效应和收入效应。解析无论什么商品，它的替代效应总是正的，所以A不正确。但是X的价格下降后，需求量出现下降，可见，其收入效应表现为负效应，所以B错误。C正确。 为什么替代效应总是正的？
NO.PZ2016010801000016 Both the substitution effeanthe income effeare negative. The substitution effeis positive anthe income effeis negative. C is correct. If X’s priis creasing, the substitution effewill lea consumer to consume more of X anconsume less substitution of X, whiremains the previous price. The substitution effeis positive. In this question, consumption of X is creasing well, therefore, income effehto negative anlarger thsubstitution effect. 考点替代效应和收入效应。 解析无论什么商品，它的替代效应总是正的，所以A不正确。 但是X的价格下降后，需求量出现下降，可见，其收入效应表现为负效应，所以B错误。C正确。 收入效应不是和是normal还是inferior有关吗，这题怎么判断是normal还是inferior呢
NO.PZ2016010801000016 No.PZ2016010801000016 (选择题) 来源: 品职出题 When there is a crease in the priof gooX, anthe consumption of gooX also creases, whiof the following statements about the substitution effeanthe income effeis most accurate? 您的回答, 正确答案是: A Both the substitution effeanthe income effeare positive. B 不正确Both the substitution effeanthe income effeare negative. C The substitution effeis positive anthe income effeis negative. 对于这个nagetive，我认为是the priof X 和 consumption of X是正相关才对吧，那为什么答案说是positive呢
NO.PZ2016010801000016 应该是问最不正确的，答案B。因为替代效应永远是正的， 不太明白A为什么错，因为当衡量normgoo，替代效应和收入效应不是都为正吗？
