The AD/AS framework implies two ways that inflationary pressures may arise. One cause is if aggregate demand continues to shift to the right when the economy is already at or near potential GDP and full employment, thus pushing the macroeconomic equilibrium into the steep portion of the aggregate supply curve. In the diagram below , there is a shift of aggregate demand to the right. The new equilibrium E1 is at a higher price level than the original equilibrium E0. In this situation, the aggregate demand in the economy has soared so high that firms in the economy are not capable of producing additional goods because labor and physical capital are fully employed, and so additional increases in aggregate demand can only result in a rise in the price level
Another source is a rise in input prices that affects many or most firms across the economy—perhaps an important input to production like oil or labor. This situation can cause the aggregate supply curve to shift back to the left. In diagram B above, the shift of the SRAS curve to the left also increases the price level from P0 at the original equilibrium E0 to a higher price level of P1 at the new equilibrium E1. In effect, the rise in input prices ends up—after the final output is produced and sold—being passed along in the form of a higher price level for outputs.
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