本题目来源于试卷: IB Economics Unit 3.1: Macroeconomics - Economic Output, AD & AS，类别为 IB经济学
[单选题]
In the new classical model the economy is in equilibrium at point W. Suppose consumers become optimistic about the performance of the economy. Identify the short-run and long-run equilibrium points in the diagram.
A. Short Run is W,Long Run is X
B. Short Run is W,Long Run is Z
C. Short Run is X,Long Run is Y
D. Short Run is X,Long Run is Z
参考答案: C
本题详细解析:
If consumers become optimistic about the performance of the eco92 ends7w)mu enomy, aggregate demand shifts to the right (AD to me s2)e97w udn$AD_1$). Short-run equilibrium occurs at the point of intersection of $AD_1$ and SRAS. Hence the short-run equilibrium is at point X.
Eventually, workers start demanding higher wages which leads to an increase in production costs and the short-run aggregate supply curve shifts left (SRAS to $SRAS_1$ ). The economy returns to full-employment equilibrium at point Y.
Options A, B and D incorrectly identify:
Point W (the full-employment equilibrium before AD shifts rightward)
Point Z (short-run equilibrium if AD shifts leftward)
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