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The short run aggregate supply curve will shift to the right when:

  • A.Energy prices increase
  • B.Prices of input decrease
  • C.Investment spending decreases
  • D.Productivity rate decreases

Answer: B

The short run aggregate supply curve shifts to the right when the cost of production falls or productive capacity grows. A fall in the prices of inputs lowers the cost of producing each level of output, so firms supply more at each price level. Higher energy prices and a lower rate of productivity raise costs and shift it to the left. Lower investment spending is a change in aggregate demand and, in the short run, does not raise supply. The answer is that the prices of inputs decrease, option B.

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