Average propensity

1. Propensity to consume, in economics, the proportion of total income or of an increase in income that consumers tend to spend on goods and services rather than to save. The ratio of total consumption to total income is known as the average propensity to consume; an increase in consumption caused by an addition to income divided by that increase in income is known as the marginal propensity to consume. Because households divide their incomes between consumption expenditures and saving, the sum of the propensity to consume and the propensity to save will always equal one.
2. Propensity to save, in economics, the proportion of total income or of an increase in income that consumers save rather than spend on goods and services. The average propensity to save equals the ratio of total saving to total income; the marginal propensity to save equals the ratio of a change in saving to a change in income. The sum of the propensity to consume and the propensity to save always equals one

Sources:

Propensity to consume | Consumer Behavior, Savings & Investment Definition | Britannica Money. Encyclopedia Britannica | Britannica. Retrieved from: https://www.britannica.com/money/propensity-to-consume

Propensity to save | Savings, Investment, Consumption Definition | Britannica Money. (б. д.). Encyclopedia Britannica | Britannica. Retrieved from: https://www.britannica.com/money/propensity-to-save