OC d. cannot increase spending on investment goods, but stimulating investment is a key to ending a recession. QUESTION 50 Suppose a tax cut affects aggregate demand and aggregate supply. Which of the shifts raise real GDP? a. Neither the shift of aggregate demand nor the shift of aggregate supply b. Both the shift of aggregate demand and the shift of aggregate supply OOOO C. The shift of aggregate demand, but not the shift of aggregate supply d. The shift of aggregate supply, but not the shift of aggregate demand QUESTION 51