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1. Assume the economy is in long-run equilibrium and AD decreases. According to the Keynesian Model, what will happen to...

1. Assume the economy is in long-run equilibrium and AD decreases. According to the Keynesian Model, what will happen to the equilibrium level of GDP and the Price Level? Does the New (Modern) Keynesian Model say anything different will happen?

2. Assume the economy is in long-run equilibrium and AD decreases. According to the Classical Model, what will happen to the equilibrium level of GDP and the Price Level?

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1. Economy is in long-run equilibrium and AD decreases. According to the Keynesian Model, aggregate supply curve is horizontal which implies that AD will shift to the left and this will reduce GDP only. There is no decrease in the price level.  New (Modern) Keynesian Model however suggests that aggregate supply is upward sloping in the short run so that this decrease in AD will reduce GDP as well as the price level in the short run.

2. Assume the economy is in long-run equilibrium and AD decreases. According to the Classical Model, Aggregate supply is vertical which implies that it is fixed at full employment. When AD decreases, AD shifts down but there is no change in real GDP. Only price level decreases which maintains long run equilibrium GDP level.

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