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| {{More footnotes|date=March 2008}}
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| {{Economics sidebar}}
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| '''Consumption''' is a major concept in economics and is also studied by many other social sciences. Economists are particularly interested in the relationship between consumption and income, and therefore in [[economics]] the '''consumption function''' plays a major role.
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| Different schools of economists define [[Production (economics)|production]] and consumption differently. According to [[mainstream economics|mainstream economists]], only the final purchase of [[Good (economics)|goods]] and [[Service (economics)|services]] by individuals constitutes consumption, while other types of expenditure — in particular, [[fixed investment]], [[intermediate consumption]], and government spending — are placed in separate categories (See [[consumer choice]]). Other economists define consumption much more broadly, as the aggregate of all economic activity that does not entail the design, production and [[marketing]] of [[goods and services]] (e.g. the selection, adoption, use, disposal and recycling of goods and services).{{Citation needed|date=June 2010}}
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| ==Consumption function==
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| It is a single mathematical function used to express [[consumer spending]]. It was developed by [[John Maynard Keynes]] and detailed most famously in his book ''[[The General Theory of Employment, Interest, and Money]]''. The function is used to calculate the amount of total consumption in an [[Economics|economy]]. It is made up of '''[[autonomous consumption]]''' that is not influenced by current income and '''[[induced consumption]]''' that is influenced by the economy's income level. This function can be written in a variety of ways, an example being <math> C = a + b(Y-T)</math>. This is probably the most simplistic form of the consumption function.
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| The simple consumption function is shown as the [[affine function]]:
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| :<math>C = c_0 + c_1 Y^d</math>
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| where
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| * ''C'' = total consumption,
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| * ''c<sub>0</sub>'' = autonomous consumption (''c<sub>0</sub>'' > 0),
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| * ''c<sub>1</sub>'' is the [[marginal propensity to consume]] (''ie the induced consumption'') (0 < ''c<sub>1</sub>'' < 1), and
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| * ''Y<sup>d</sup>'' = disposable income (income after government intervention – benefits, taxes and transfer payments – or Y + (G – T)).
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| Autonomous consumption represents consumption when income is zero. In estimation, this is usually assumed to be positive. The marginal propensity to consume (MPC), on the other hand measures the rate at which consumption is changing when income is changing. In a geometric fashion, the MPC is actually the slope of the consumption function.
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| The MPC is assumed to be positive. Thus, as income increases, consumption increases. However, Keynes mentioned that the increases (for income and consumption) are not equal. According to him, "as income increases, consumption increases but not by as much as the increase in income". | |
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| ==Behavioural Economics and Consumption==
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| The Keynesian consumption function is also known as the [[absolute income hypothesis]], as it only bases consumption on current income and ignores potential future income (or lack of). Criticism of this assumption lead to the development of [[Milton Friedman]]'s [[permanent income hypothesis]] and [[Franco Modigliani]]'s [[life cycle hypothesis]]. More recent theoretical approaches are based on behavioral economics and suggest that a number of behavioural principles can be taken as microeconomic foundations for a behaviourally-based aggregate consumption function.<ref>{{cite journal |last=D'Orlando |first=F. |last2=Sanfilippo |first2=E. |year=2010 |title=Behavioral foundations for the Keynesian Consumption Function |journal=[[Journal of Economic Psychology]] |volume=31 |issue=6 |pages=1035–1046 |doi=10.1016/j.joep.2010.09.004 }}</ref>
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| ==Consumption and Household Production==
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| Consumption is defined in part by comparison to [[Production theory basics|production]].
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| In the tradition of the Columbia School of Household Economics also known as the [[New Home Economics]] commercial consumption has to be analyzed in the context of household production. Opportunity cost of time affects the cost of home-produced substitutes and therefore demand for commercial goods and services.<ref>{{cite book |last=Mincer |first=Jacob |year=1963 |chapter=Market Prices, Opportunity Costs, and Income Effects |editor-first=C. |editor-last=Christ |title=Measurement in Economics |location=Stanford, CA |publisher=Stanford University Press |isbn= }}</ref><ref>{{cite journal |first=Gary S. |last=Becker |year=1965 |title=A Theory of the Allocation of Time |journal=Economic Journal |volume=75 |issue=299 |pages=493–517 |jstor=2228949 }}</ref> The elasticity of demand for consumption goods is also a function of who performs chores in households and how their spouses compensate them for opportunity costs of home production.<ref>{{cite journal |first=Shoshana |last=Grossbard-Shechtman |title=A Consumer Theory with Competitive Markets for Work in Marriage |journal=Journal of Socio-Economics |volume=31 |issue=6 |pages=609–645 |year=2003 |doi=10.1016/S1053-5357(02)00138-5 }}</ref>
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| Different schools of economists define [[Production (economics)|production]] and consumption differently. According to [[mainstream economics|mainstream economists]], only the final purchase of [[Good (economics)|goods]] and [[Service (economics)|services]] by individuals constitutes consumption, while other types of expenditure — in particular, [[fixed investment]], [[intermediate consumption]], and government spending — are placed in separate categories (See [[consumer choice]]). Other economists define consumption much more broadly, as the aggregate of all economic activity that does not entail the design, production and [[marketing]] of [[goods and services]] (e.g. the selection, adoption, use, disposal and recycling of goods and services).{{Citation needed|date=June 2010}}
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| Consumption can also be measured by a variety of different ways such as [[energy]] in [[energy economics]] metrics.
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| ==Effects of consumption==
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| Aggregate consumption can increase aggregate demand.<ref>http://www.consumptiongrowth101.com/Basics.html</ref>
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| ==Old-age spending==
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| ''Spending the Kids' Inheritance'' (originally the title of a book on the subject by [[Annie Hulley]]) and the acronyms SKI and SKI'ing refer to the growing number of [[retire|older people]] in [[Western culture|Western society]] spending their [[money]] on [[travel]], [[cars]] and [[property]], in contrast to previous [[generations]] who tended to leave that money to their [[children]].
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| ''Die Broke'' (from the book ''Die Broke: A Radical Four-Part Financial Plan'' by Stephen Pollan and, Mark Levine) is a similar idea.
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| ==See also==
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| * [[Aggregate demand]]
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| * [[Life cycle hypothesis]]
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| * [[Measures of national income and output]]
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| * [[Permanent income hypothesis]]
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| * [[consumer debt]]
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| * [[Classification of Individual Consumption by Purpose]] (COICOP)
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| * [[Consumer choice]]
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| * [[Consumerism]]
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| * [[List of largest consumer markets]]
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| * [[Over-consumption]]
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| ==References==
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| {{Reflist}}
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| ==Further reading==
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| * {{cite book |author=Bourdieu, Pierre |authorlink=Pierre Bourdieu |title=[[Distinction: A Social Critique of the Judgement of Taste]] (paperback)|publisher=[[Harvard University Press]] |location=Cambridge |year=1984 |pages= |isbn=0-674-21277-0 |oclc= |doi=}} Also:{{cite book |publisher=London |location=Lincoln |year=1984 |pages= |isbn=0-415-04546-0 |oclc= |doi=}}
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| * {{cite book|author=Deaton, Angus|year=1992|title=Understanding Consumption|publisher=[[Oxford University Press]] |isbn=0-19-828824-7}}
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| * {{cite book |author=Friedman, Jonathan|year=1994|title=Consumption and Identity (Studies in Anthropology & History) |publisher=[[Taylor & Francis]] |location=Washington, DC |pages= |isbn=3-7186-5592-6 |oclc= |doi=}}
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| * {{cite book |author=Isherwood, Baron C.; Douglas, Mary |title=The World of Goods: Towards an Anthropology of Consumption (Paperback) |publisher=[[Routledge]] |location=New York |year=1996 |pages= |isbn=0-415-13047-6 |oclc= |doi=}}
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| * {{cite book |author=Mackay, Hugh (Editor) |title=Consumption and Everyday Life (Culture, Media and Identities series) (Paperback) |publisher=[[SAGE Publications]] |location=Thousand Oaks, Calif |year=1997 |pages= |isbn=0-7619-5438-4 |oclc= |doi=}}
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| * {{cite book |author=Miller, Daniel |title=A Theory of Shopping (paperback) |publisher=[[Cornell University Press]] |location=[[Ithaca, N.Y.]] |year=1998 |pages= |isbn=0-8014-8551-7 |oclc= |doi=}}
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| * {{cite book |author=Slater, Don |title=Consumer Culture and Modernity |publisher=Polity Press |location=Cambridge, UK |year=1997 |pages= |isbn=0-7456-0304-1 |oclc= |doi=}}
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| ==External links==
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| * [http://www.economic-truth.co.uk/content-essays/bsc/keynesconsumption.pdf An essay examining the strengths and weaknesses of Keynes's theory of consumption]
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| {{Consumer behaviour}}
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| {{Consumption}}
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| [[Category:Macroeconomics]]
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| [[Category:Consumer theory]]
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| [[bn:ভোগ অপেক্ষক]]
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| [[bg:Функция на потреблението]]
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| [[de:Konsumfunktion]]
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| [[nl:Consumptiefunctie]]
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| [[pt:Função de consumo]]
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