Assume that MPE = 0.900, then answer the following questions: (round to the nearest dollar value) a. If government expenditures fall by $600, by how much will the total planned expenditure curve shift downward? The curve will shift down by $ 600 By how much will equilibrium income change? Equilibrium change in Y = $ 6000 b. If taxes fall by $600, by how much will the total planned expenditure curve shift upward? The curve will shift up by S By how much will equilibrium income change? Equilibrium change in Y = $