Please help me for homework, 1) Describe the marginal propensity to consume and show how it is computed. 2) Discuss how spending and output influences equilibrium in a simple model where aggregate expenditure =consumption. 3) Describe how unplanned inventory can in influence equilibrium in the model where AE=(C+I+G+(x-M)) 4, Briefly describe the expenditure multiplier and state how it is computed. How is it different from the tax multiplier?