Equations for $C$, $I$, $G$, and $NX$ are given below. If the equilibrium level of $GDP$ is $\$21,500$, what is the marginal propensity to consume?
$$C = 1,500 + (MPC)\cdot Y$$ $$I = 1,000$$ $$G = 2,000$$ $$NX = -200$$
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