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ruby5ltc · 2022年03月29日

没看懂答案解析

NO.PZ2016010802000109

问题如下:

Following a sharp increase in the price of energy, the overall price level is most likely to rise in the short run:

选项:

A.

and remain elevated indefinitely unless the central bank tightens.

B.

but be unchanged in the long run unless the money supply is increased.

C.

and continue to rise until all prices have increased by the same proportion.

解释:

B is correct.

An increase in energy prices will shift the short-run aggregate supply curve (SRAS) to the left, reducing output and increasing prices.

If there is no change in the aggregate demand curve, in particular if the central bank does not expand the money supply, slack in the economy will put downward pressure on in input prices, shifting the SRAS back to its original position. In the long run, the price level will be unchanged.

考点:AS曲线

解析:能源价格的攀升会造成总供给的衰退,总供给的衰退在长期会引起原材料价格的下降,从而使得总供给回到初始水平。这期间,如果该国央行不实施干预,那么总需求就不会发生改变。

总供给和总需求在长期都未改变的结果就是物价水平保持不变。

没看懂答案解析

1 个答案

笛子_品职助教 · 2022年03月29日

嗨,爱思考的PZer你好:


这题不是知识点不理解的问题,而是,这道题本身的英文表述晦涩难懂。


这个题目还是把题干和选项连起来读一下就可以理解了。

题干里,一个剧烈的能源价格上涨,描述的是短期的情形。因为只有短期,能源价格才可能“剧烈(sharp)”上涨。长期,能源价格不可能“剧烈(sharp)”上涨。

但是选项,描述的是长期。


连起来就是短期的能源价格上涨,对长期物价水平有没有影响:答案是,没影响,选B


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虽然现在很辛苦,但努力过的感觉真的很好,加油!

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