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]
Identify which of the following is most likely to have caused the shift from $LRAS_1$ to $LRAS_2$ in the diagram above.
I. Improvements in technology
II. Increase in immigration
III.Decrease in costs of factors of production ($FOP_S$)
IV. Decrease in indirect taxes
A. I and II only
B. I and III only
C. II and IV only
D. III and IV only
参考答案: A
本题详细解析:
LRAS shifts rightward when there is an increase in the quantity or qualityav;2x (::m0 qijppjqx of factors of production (FOPs), improvements in technology, increases in efficiency, or improvements in institutions.
Choices I and II: both will shift LRAS to the right. An increase in immigration increases the quantity of labour, and improvements in technology will increase efficiency in production, improving the quality of FOPs.
Choices III and IV are determinants of SRAS that would lower production costs and thus shift the SRAS curve rightward. Indirect taxes and production costs do not affect the qa: ;(qx0jpiq: pj mv2xuality or quantity of FOPs, so LRAS is unaffected.
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