"Which of the statements best describes why the aggregate demand curve is downward sloping?
a. An increase in the aggregate price level causes consumer and investment spending to fall, because consumer and money demand increases. purchasing power
b. As a good's price increases, holding all else constant, the good's quantity demanded decreases. c. As the aggregate price level increases, consumer expectations about the future change.
d. As the aggregate price level decreases, the stock of existing physical capital increases. decreases "