2. Consumption and saving definitions Suppose Ana gets a sales bonus at her place of work that gives her an extra $600 of disposable income. She chooses to spend $480 and save the remaining $120. From this, you can tell that Ana's marginal propensity to consume (MPC) is , and her marginal propensity to save (MPS) is . Mathematically, it must always be true that: Consumption = Therefore, it must also be true that: MPC =

From this, you can tell that Ana's marginal propensity to consume (MPC) is 0.80, and her marginal propensity to save (MPS) is 0.20. Mathematically, it must always be true that: Consumption = Therefore, it must also be true that: MPC = 1 - MPS.

Explanation:

Marginal propensity to consume refers to amount that a household decides to spend of every extra dollar that they earn. Since you either spend or save money, the marginal propensity to save is the portion that you decided not to spend, and therefore, save.

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