Mathematically, it must always be true that:   Saving  =a. Disposable income+Comsumption b. Comsumption-Disposable income c. Disposable income-Consumption   Therefore, it must also be true that:

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Suppose Becky gets a sales bonus at her place of work that gives her an extra $400 of disposable income. She chooses to spend $300 and save the remaining $100.
From this, you can tell that Becky's marginal propensity to consume (MPC) is0.75   , and her marginal propensity to save (MPS) is0.25   .
 
Mathematically, it must always be true that:
 
Saving  =
a. Disposable income+Comsumption
b. Comsumption-Disposable income
c. Disposable income-Consumption
 
Therefore, it must also be true that:
 
MPS =

a. 1-MPC

b. 1+MPC

c. MPC

 
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