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'''[[Ordinal scale|Ordinal]] utility''' [[Economic theory|theory]] states that while the [[utility]] of a particular [[good (economics)|good]] or service cannot be measured using a numerical scale bearing economic meaning in and of itself, pairs of alternative bundles (combinations) of goods can be ordered such that one is considered by an individual to be worse than, equal to, or better than the other. This contrasts with [[cardinal utility]] theory, which generally treats utility as something whose numerical value is meaningful in its own right.
The concept was first introduced by [[Vilfredo Pareto|Pareto]] in 1906.<ref>{{cite journal|last=Pareto|first=Vilfredo|title=Manuale di economia politica, con una introduzione alla scienza sociale|journal=Societa Editrice Libraria|year=1906}}</ref>


==Indifference curve mappings==


When a large number of bundles of goods are compared, the preferences of the individual can be seen. This information is usually put together on a graph called an indifference map. One of these is shown below:
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[[image:Simple-indifference-curves.svg|200px|indifference map]]
 
Each [[indifference curve]] is a set of points, each representing a combination of quantities of two goods or services, all of which combinations the consumer is equally satisfied with. The further a curve is from the origin, the greater is the level of utility. The slope of the curve (the negative of the [[marginal rate of substitution]] of X for Y) at any point shows the rate at which the individual is willing to trade off good X against good Y maintaining the same level of utility. The curve is convex to the origin as shown assuming the consumer has a diminishing marginal rate of substitution. It can be shown that consumer analysis with indifference curves (an ordinal approach) gives the same results as that based on [[cardinal utility]] theory — i.e., consumers will consume at the point where the marginal rate of substitution between any two goods equals the ratio of the prices of those goods (the equi-marginal principle).
 
==Revealed preference==
 
[[Revealed preference theory]] addresses the problem of how to observe ordinal preference relations in the real world. The challenge of revealed preference theory lies in part in determining what goods bundles were foregone, on the basis of the being less liked, when individuals are observed choosing particular bundles of goods.<ref>{{Cite conference
| title =        Revealed Preference Theory
| author=    Chiaki Hara
| date=        6 June 1998
| booktitle= 7th Toiro-kai meeting (1997/1998)
| url=            http://www.societies.cam.ac.uk/cujif/ABSTRACT/980606.htm
}}</ref>
<ref>{{Cite journal
| title=            Mistakes in Choice-Based Welfare Analysis
| author=      Botond Koszegi
| coauthors= Matthew Rabin
| journal=      American Economic Review Papers and Proceedings
| volume=    97
| issue=        2
| pages=      477–481
| date=        May 2007
| url=            http://elsa.berkeley.edu/~botond/mistakeschicago.pdf
}}</ref>
 
==Ordinal utility functions==
 
An ordinal utility function describing a consumer's preferences over, say, two goods can be written as
 
:<math>u(x, y)</math>
 
where ''x'' and ''y'' are the quantities of the goods consumed. Both partial derivatives of this function are positive if the consumer prefers more of both goods. But the same preferences could be expressed as another utility function that is a monotonic transformation of ''u'':
 
:<math>g(x, y) \equiv f(u(x, y)),</math>
 
where ''f'' is ''any'' globally increasing function. Utility functions ''g'' and ''u'' give rise to identical indifference curve mappings. Thus in ordinal utility theory, there is no concept of [[diminishing marginal utility]], which would correspond to the second derivative of utility being negative. For example, even if ''u'' has a negative second derivative with respect to ''x'', the equivalent utility function ''g'' may have a positive second derivative with respect to ''x''.
 
== See also ==
*[[Cardinal utility]]
*[[Consumer theory]]
*[[Marginal utility]]
 
== References ==
{{Reflist}}
 
==External links==
* Ordinal utility vs. Cardinal utility
** [[Murray N. Rothbard]], [http://mises.org/daily/2205 "Towards a Reconstruction of Utility and Welfare Economics"]
 
[[Category:Utility]]

Latest revision as of 02:38, 26 November 2014


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