Autonomous consumption - 200 MPC=0.8 Planned investment = 600 a. Find the equation for the aggregate expenditure curve. b. The equilibrium level of output in this economy is 4,000. Show how you would find this equilibrium output. c. What is the spending multiplier of this economy? d. Suppose currently our economy is producing at real GDP of 4,500. How much is the unplanned inventory investment? e. Will output stay at 4,500? Describe what will happen in the future using the Inventory adjustment process. f. Suppose we are back at the equilibrium and autonomous consumption falls by 50. What is the new equilibrium output? Use the spending multiplier in part (c) to answer this question.