Consumption function

In economics, the consumption function describes a relationship between consumption and disposable income.^[1]^[2] The concept is believed to have been introduced into macroeconomics by John Maynard Keynes in 1936, who used it to develop the notion of a government spending multiplier.^[3]

^ Algebraically, this means $C=f(Y_{d})$ where $f\colon \mathbb {R} ^{+}\to \mathbb {R} ^{+}$ is a function that maps levels of disposable income $Y_{d}$ —income after government intervention, such as taxes or transfer payments—into levels of consumption $C$ .
^ Lindauer, John (1976). Macroeconomics (Third ed.). New York: John Wiley & Sons. pp. 40–43. ISBN 0-471-53572-9.
^ Hall, Robert E.; Taylor, John B. (1986). "Consumption and Income". Macroeconomics: Theory, Performance, and Policy. New York: W. W. Norton. pp. 63–67. ISBN 0-393-95398-X.