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十个馒头 · 2022年07月12日

为什么替代效应总是正的?

NO.PZ2016010801000016

问题如下:

When there is a decrease in the price of good X, and the consumption of good X also decreases, which of the following statements about the substitution effect and the income effect is most accurate?

选项:

A.

Both the substitution effect and the income effect are positive.

B.

Both the substitution effect and the income effect are negative.

C.

The substitution effect is positive and the income effect is negative.

解释:

C is correct.

If X’s price is decreasing, the substitution effect will lead a consumer to consume more of X and consume less substitution of X, which remains the previous price. The substitution effect is positive. In this question, consumption of X is decreasing as well, therefore, income effect has to be negative and larger than substitution 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选项不正确。

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选项错误。C选项正确。

为什么替代效应总是正的?

1 个答案
已采纳答案

笛子_品职助教 · 2022年07月13日

嗨,努力学习的PZer你好:


正是指:价格下降,需求上升。负是指,价格下降,需求下降。

我们看基础讲义28页,红线的这句话:当价格下降时,出于替代的考虑,需求量是上升的,因此为正。

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