单选题
For a demand-pull effect or a cost-push effect to cause inflation:
A、
the AD curve has to shift in response to a shift of the AS curve.
B、
the cause of the shift in AD or AS must be repeated or sustained.
C、
economic equilibrium must be re-established at a higher price level.
【正确答案】
B
【答案解析】
[解析] 为了使AD曲线向右移动(需求拉动型通货膨胀)或AS曲线向左移动(成本推动型通货膨胀)，相关的原因必须可重复或可持续。否则，价格水平将只发生一次上涨，从而无法使AD曲线或AS曲线发生移动。
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