how much is gdp increased if mpc is .8 and new spending is 90 000
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propensity to consume (MPC) and marginal propensity to save (MPS) describe consumer behavior with respect to their income. MPC is the ratio of the change in the amount a person spends to the change in that person's overall income, whereas MPS is the same ratio with savings as the metric of interest. Because people either spend or do not spend (that is, save) whatever income they earn, the sum of MPC and MPS is always equal to 1.
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