An aggregate supply curve may be horizontal over some range because within that range
(A) a higher price level leads to higher interest rates, which reduce the money supply and consumer spending
(B) changes in the aggregate price level do not induce substitution
(C) output cannot be increased unless prices and interest rates increase
(D) rigid prices prevent employment from fluctuating
(E) resources are underemployed and an increase in demand will be satisfied without any pressure on the price level
Answer: E
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