CONSUMPTION FUNCTION: The positive relation between household consumption expenditures and household disposable income that forms one of the key building blocks for Keynesian economics. The consumption function is commonly presented as the consumption line or propensity-to-consume line. The slope of this line is the marginal propensity to consume, which is the proportion of any additional income used for consumption. The consumption function and the marginal propensity to consume play key roles in the multiplier and accelerator concepts. Because saving is the difference between disposable income and consumption, the saving function is a complementary relation to the consumption function.

     See also | Keynesian economics | consumption expenditures | disposable income | consumption line | multiplier | accelerator | saving function | income-expenditure model | marginal propensity to consume | induced consumption | autonomous consumption |

CONSUMPTION FUNCTION, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: June 6, 2026].

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The economy produces four distinct types of goods based on two key characteristics -- consumption rivalry and nonpayer excludability. Consumption rivalry arises if consumption of a good by one person prevents another from also consuming. Nonpayer excludability means potential consumers who do not pay for a good can be excluded from consuming. Private goods are rival in consumption and easily subject to the exclusion of nonpayers. Public goods are nonrival in consumption and the exclusion of nonpayers is virtually impossible. Near-public goods are nonrival in consumption and easily subject to exclusion. Common-property goods are rival in consumption and not easily subject to exclusion. Private goods can be efficiently exchanged through markets. Public, near-public and common-property goods cannot, but require some degree of government involvement for efficiency.

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