C.
is vertical because changes in the price level have no effect on real output.
The long-run aggregate supply curve
Part 2
A.
shows the various amounts of real output businesses are willing to consume at each price level.
B.
is downward sloping because a higher price level causes businesses and consumers to reduce spending.
C.
is vertical because changes in the price level have no effect on real output.
D.
is vertical because a change in real GDP has no effect on the price level.
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