Suppose the MPC = 0.90 and there are no taxes or imports. What does the multiplier equal? If the initial equilibrium aggregate expenditure is $12 trillion, what will be the effect on aggregate expenditure of a $100 billion increase in investment?

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The Answer of Suppose the MPC = 0.90 and there are no taxes or imports. What does the multiplier equal? If the initial equilibrium aggregate expenditure is $12 trillion, what will be the effect on aggregate expenditure of a $100 billion increase in investment?