In the Keynesian Cross model, assume that the consumption function is given by C = 120 + 0.8(Y T). Planned investment is 200. Government spending and taxes are both 400. a. What is the equilibrium level of income? What is the equilibrium level of expenditure? b. Suppose income rises to 2400. What are the levels of consumption, planned investment, and government spending in this case? Calculate the new level of planned expenditure. c. With income still at 2400, what is the level of actual investment? How does this differ with planned investment? What kind of investment is responsible for the difference? d. Ultimately, expenditure and income/output will move back into their original equilibrium. Why is this the case?