A. The aggregate expenditures model states that savings and that savings will increase when disposable income or real GDP.

b. Which of the following concepts illustrates how much savings will change when disposable income or real GDP increases by $1?

- Marginal propensity to save (MPS)

- Autonomous consumption

- Disposable savings

- Marginal propensity to consume (MPC)

(a) Either positive or negative; Increases

(b) Marginal propensity to save (MPS)

Explanation:

(a) We know that savings is directly related to the income level of the consumers. Savings may be positive or negative as it is dependent upon the level of disposable income. This means that an increase in the disposable income or Real GDP will lead to more savings.

(b) Marginal propensity to save refers to the proportion of the income (Disposable) that is saved by the consumer rather than spending for consumption of goods and services. It is defined as the extra amount of income that is saved by the household or consumer.