4. (1 point) The main difference between demand pull inflation and cost push inflation is _______. a. P increases in the former and decreases in the latter. b. There is no difference since GDP increases in both cases. c. The consequence on the P level is different. d. The causes of the increas in P are different.The Covid-19 pandemic shifted the aggregate supply and aggregate demand curves to the left. 6. (1 point) The fiscal stimulus is designed to ____________. a. Decrease aggregate demand (AD) curve. b. Increase aggregate demand (AD) curve. c. Increase aggregate supply (AS) curve. d. Decrease aggregate supply (AS) curve