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Susie · 2023年03月26日

这题为什么选A(L)区域?

NO.PZ2022071403000094

问题如下:

Question

MAX17009-MC-Fb

The gain in government revenues arising from the imposition of the tariff is best described by area(s):

The diagram below shows the domestic demand and supply curves for a country that imports a commodity, where PW is its world price and PT is its domestic price after the imposition of a tariff.

选项:

A.L. B.J. C.K + M.

解释:

Solution

A is correct. With the imposition of the tariff, domestic supply will increase from Q1 to Q2, but domestic demand will fall from Q4 to Q3. The net amount imported will be Q3Q2. The change in government revenues is Area L, which is the rectangle (Q3Q2) × (PTPW).

B is incorrect. It is the gain in producer surplus.

C is incorrect. It is deadweight loss.



1 个答案

笛子_品职助教 · 2023年03月28日

嗨,努力学习的PZer你好:


这题为什么选A(L)区域?


Hello,亲爱的同学!


本题考查基础讲义346页的一张图。本题的L区域就是基础讲义的C区域,代表tariff revenue or quota rents(也就是本题中的The gain in government revenues arising from the imposition of the tariff)



因为原来的价格是P*,实施关税后,价格上涨了,涨到了Pt。既然价格涨了,自然会多出来额外的收益。只是注意,这里数量也变了。在PT的价格,因为价格高了,供应会增加。supply数量从关税前P*价格的Q1变到Q2。同理,在PT价格,因为价格高了,需求会减少,demand从关税前P*价格的Q4变为Q3.


所以这个供需差的数量,以及上涨的价格幅度,就成了政府的tariff revenue or quota rents。





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