Refer to the figure below: (average price) Price Level PF 5.8 6.0 6.2 QF Real Output (trillions of dollars per year) Figure 11.1 Assuming that the aggregate demand is at AD1 and equilibrium a, if the MPC is .50, how much initial stimulus would be need to move the economy to full employment? $200 billion $400 billion $100 billion $800 billion