The U.S. economy has had persistent inflation in recent decades. A possible explanation for the inflation is that
A. there have been decreases in aggregate demand while aggregate supply has remained unchanged.
B. there have been increases in the growth rate while aggregate demand has remained unchanged.
C. there have been decreases in the growth rate while aggregate demand has remained unchanged.
D. growth in aggregate demand has been greater than growth in aggregate supply.
Answer: D
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