问题如下图：
选项：
A. 
B. 
C. 
解释：
老师这题我看了很久。 总觉得解释说不通，其实根据sras的图形， p和y是正相关的，potential gdp是lras的横轴。 所以我的理解是， 当real gdp< potential gdp的时候， p也就是题目里说的the aggregate price level，也就是物价水平， 其实是有可能上升或下降的。 但这道题的答案c， 错是错在答案说的不够全面，答案a是肯定不对了。所以最后只能选b了。 请问我这么理解对吗？
源_品职助教 · 2019年10月05日
一般情况下，潜在GDP小于真实GDP是由于总需求衰退引起的经济萧条。至少原版书在这里没有讨论滞涨的情况。可以看下原版书原文：
The gap between the recession output (GDPR) and the potential output (GDPP), the level of real GDP that couldbe achieved if all resources were fully utilized, is an indicator of slack resources (unemployment for labor and idleness for physical capital). Decreases in aggregate demand are likely to depress wages or wage growth as well as prices of inputs and capital goods.
所以滞涨情况就无需考虑了。
NO.PZ2018062003000114 问题如下 A client haskeyou to explain the fferences between potentiG anreG: A.Growth in potentiG measures how rapiy the toteconomy is expanng. B.If reG is below potentiG, the aggregate prilevel hwnwarpressure. C.If reG is below potentiG, the aggregate prilevel ten to rise. B is correct.Growth in reG measures how rapiy the toteconomy is expanng. If reG is below potentiG, the aggregate prilevel hwnwarpressure. If reG is above potentiG, the aggregate prilevel hupwarpressure.考点potentiG解析是真实G而非potentiG 能够准确衡量一国G的增长情况，所以A不入选。如果当前真实G小于potentiG ，表明该国当前经济不景气，物价就可能面临下行压力，所以B正确，而C错误。 potentiG是长期G，而reG是短期G，后者在前者之下按照讲义上的图来看，shortrun肯定是在longrun以下啊，为什么会有priwnwar趋势呢？请老师讲细一点
NO.PZ2018062003000114 问题如下 A client haskeyou to explain the fferences between potentiG anreG: A.Growth in potentiG measures how rapiy the toteconomy is expanng. B.If reG is below potentiG, the aggregate prilevel hwnwarpressure. C.If reG is below potentiG, the aggregate prilevel ten to rise. B is correct.Growth in reG measures how rapiy the toteconomy is expanng. If reG is below potentiG, the aggregate prilevel hwnwarpressure. If reG is above potentiG, the aggregate prilevel hupwarpressure.考点potentiG解析是真实G而非potentiG 能够准确衡量一国G的增长情况，所以A不入选。如果当前真实G小于potentiG ，表明该国当前经济不景气，物价就可能面临下行压力，所以B正确，而C错误。 potentig不是一个理论值吗？应该基本上所有国家的g都小于potentig吧，为什么是衰退？
NO.PZ2018062003000114问题如下A client haskeyou to explain the fferences between potentiG anreG:A.Growth in potentiG measures how rapiy the toteconomy is expanng.B.If reG is below potentiG, the aggregate prilevel hwnwarpressure.C.If reG is below potentiG, the aggregate prilevel ten to rise.B is correct.Growth in reG measures how rapiy the toteconomy is expanng. If reG is below potentiG, the aggregate prilevel hwnwarpressure. If reG is above potentiG, the aggregate prilevel hupwarpressure.考点potentiG解析是真实G而非potentiG 能够准确衡量一国G的增长情况，所以A不入选。如果当前真实G小于potentiG ，表明该国当前经济不景气，物价就可能面临下行压力，所以B正确，而C错误。 之前做题时遇到说AAS曲线的横轴代表reG，根据AS曲线的超短期，短期，长期三段，长期那里对应的才是potentiG，那么reG小于potentiG就意味着是AS曲线的前两段，即先不变再上升。麻烦老师看看这个逻辑到底哪里有问题呢？
NO.PZ2018062003000114 经济在长期会不会趋近于potentig呀？如果会的话那是不是说明经济会变好从而导致价格上涨？
NO.PZ2018062003000114 If reG is below potentiG, the aggregate prilevel hwnwarpressure. If reG is below potentiG, the aggregate prilevel ten to rise. B is correct. Growth in reG measures how rapiy the toteconomy is expanng. If reG is below potentiG, the aggregate prilevel hwnwarpressure. If reG is above potentiG, the aggregate prilevel hupwarpressure. 考点potentiG 解析是真实G而非potentiG 能够准确衡量一国G的增长情况，所以A不入选。 如果当前真实G小于potentiG ，表明该国当前经济不景气，物价就可能面临下行压力，所以B正确，而C错误。 经济不景气导致物价下行的可能，是如何推导出来的？
