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jay1180 · 2022年10月13日

“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。” 不理解啊

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。

短期的能源价格上涨,对长期物价水平没有影响~~

为啥啊~

1 个答案

笛子_品职助教 · 2022年10月14日

嗨,爱思考的PZer你好:


短期的能源价格上涨,对长期物价水平没有影响~~

为啥啊~


Hello,亲爱的同学!

短期能源价格上涨,对短期价格水平是有影响的。

但是在长期,能源价格上涨是不可持续的,短期价格上涨后,最后它还会再跌回来。最终在长期就没有影响了。

因为在我们的基础讲义中,长期供应曲线是一条垂直线,LRAS,长期来看,Y是不变的。那么当AD也不变时,物价就是不变的了。

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