Marginal Propensity to Consume and Related Concepts

This set of flashcards covers key concepts and formulas related to the Marginal Propensity to Consume and its impact on consumption and output.

MPC

Marginal Propensity to Consume; the ratio of change in consumption to change in income.

Formula for MPC

$$MPC = rac{ ext{change in consumption}}{ ext{change in income}}$$

Consumption Function

The relationship between consumption (c), disposable income (Y), autonomous consumption (a), and marginal propensity to consume (b): $c = a + b(Y)$.

Output Equation

The equation that defines output (Y) in relation to autonomous consumption, tax, investment (I), and government spending (G): $Y = a + b(Y - t) + I + G$.

Autonomous Consumption (a)

The level of consumption when income is zero, typically ranging from 1 to 100.

Marginal Propensity to Consume (b)

The increase in consumption resulting from an increase in income, typically ranging from 0.1 to 0.9.

Change in Taxes Affect on Output

The change in output due to a change in taxes is given by: $\Delta T\left(\frac{-b}{1-b}\right)=\Delta Y$ .

Change in Investment Affect on Output

The change in output due to a change in investment is given by: $\Delta I\left(\frac{1}{1-b}\right)=\Delta Y$ .

Change in Government Spending Affect on Output

The change in output due to a change in government spending is given by: $\Delta G\left(\frac{1}{1-b}\right)=\Delta Y$ .