Why would fiscal policy be effective where the economy is relatively distant from potential output but not in an economy where aggregate supply curve is steep?

为什么当经济相对远离潜在产出时，而不是在一个经济体在总供给曲线是陡峭的时候财政政策才是有效的？

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The derivation of aggregate supply curve is one of the most important parts of macroeconomics.

总供给曲线的推导是宏观经济学中的最重要内容之一。

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In the short run, the aggregate supply curve is flat. In the long run, the aggregate supply curve is vertical.

在短期，总供给曲线是水平的。？在长期，总供给曲线是垂直的。

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