为什么要保持AD不变呢？

NO.PZ2016010802000109 问题如下 Following a sharp increase in the priof energy, the overall prilevel is most likely to rise in the short run: A.anremain elevateinfinitely unless the centrbank tightens. B.but unchangein the long run unless the money supply is increase C.ancontinue to rise until all prices have increasethe same proportion. is correct.increase in energy prices will shift the short-run aggregate supply curve (SRAS) to the left, recing output anincreasing prices.If there is no change in the aggregate mancurve, in particulif the centrbank es not expanthe money supply, slain the economy will put wnwarpressure on in input prices, shifting the SRbato its originposition. In the long run, the prilevel will unchange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。 RT

NO.PZ2016010802000109 问题如下 Following a sharp increase in the priof energy, the overall prilevel is most likely to rise in the short run: A.anremain elevateinfinitely unless the centrbank tightens. B.but unchangein the long run unless the money supply is increase C.ancontinue to rise until all prices have increasethe same proportion. is correct.increase in energy prices will shift the short-run aggregate supply curve (SRAS) to the left, recing output anincreasing prices.If there is no change in the aggregate mancurve, in particulif the centrbank es not expanthe money supply, slain the economy will put wnwarpressure on in input prices, shifting the SRbato its originposition. In the long run, the prilevel will unchange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~

NO.PZ2016010802000109问题如下 Following a sharp increase in the priof energy, the overall prilevel is most likely to rise in the short run:A.anremain elevateinfinitely unless the centrbank tightens.B.but unchangein the long run unless the money supply is increaseC.ancontinue to rise until all prices have increasethe same proportion.is correct.increase in energy prices will shift the short-run aggregate supply curve (SRAS) to the left, recing output anincreasing prices.If there is no change in the aggregate mancurve, in particulif the centrbank es not expanthe money supply, slain the economy will put wnwarpressure on in input prices, shifting the SRbato its originposition. In the long run, the prilevel will unchange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。​能源价格的攀升会造成总供给的衰退，这部分理解。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，这部分在曲线图上的表现是原路返回吗？如果要达到均衡，不会在一个价格更高的位置吗？

NO.PZ2016010802000109问题如下Following a sharp increase in the priof energy, the overall prilevel is most likely to rise in the short run:A.anremain elevateinfinitely unless the centrbank tightens.B.but unchangein the long run unless the money supply is increaseC.ancontinue to rise until all prices have increasethe same proportion.is correct.increase in energy prices will shift the short-run aggregate supply curve (SRAS) to the left, recing output anincreasing prices.If there is no change in the aggregate mancurve, in particulif the centrbank es not expanthe money supply, slain the economy will put wnwarpressure on in input prices, shifting the SRbato its originposition. In the long run, the prilevel will unchange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。老师，我想问一下，为什么energy price上升会使得总供给下降。谢谢