In
economics
Economics () is the social science that studies the Production (economics), production, distribution (economics), distribution, and Consumption (economics), consumption of goods and services.
Economics focuses on the behaviour and intera ...
and other
social science
Social science is one of the branches of science, devoted to the study of societies and the relationships among individuals within those societies. The term was formerly used to refer to the field of sociology, the original "science of soc ...
s, preference is the order that an
agent
Agent may refer to:
Espionage, investigation, and law
*, spies or intelligence officers
* Law of agency, laws involving a person authorized to act on behalf of another
** Agent of record, a person with a contractual agreement with an insuranc ...
gives to alternatives based on their relative
utility
As a topic of economics, utility is used to model worth or value. Its usage has evolved significantly over time. The term was introduced initially as a measure of pleasure or happiness as part of the theory of utilitarianism by moral philosopher ...
. A process which results in an "optimal
choice
A choice is the range of different things from which a being can choose. The arrival at a choice may incorporate motivators and models. For example, a traveler might choose a route for a journey based on the preference of arriving at a give ...
" (whether real or theoretical). Preferences are evaluations and concern matters of value, typically in relation to practical reasoning. The character of the preferences is determined purely by a person's tastes instead of the good's prices,
personal income
In economics, personal income refers to an individual's total earnings from wages, investment enterprises, and other ventures. It is the sum of all the incomes received by all the individuals or household during a given period. Personal income is ...
, and the availability of goods. However, people are still expected to act in their best (rational) interest.
Rationality
Rationality is the quality of being guided by or based on reasons. In this regard, a person acts rationally if they have a good reason for what they do or a belief is rational if it is based on strong evidence. This quality can apply to an abil ...
, in this context, means that when individuals are faced with a choice, they would select the option that maximizes
self-interest
Self-interest generally refers to a focus on the needs or desires (''interests'') of one's self. Most times, actions that display self-interest are often performed without conscious knowing. A number of philosophical, psychological, and economi ...
. Moreover, in every set of alternatives, preferences arise.
The belief of preference plays a key role in many disciplines, including
moral philosophy
Ethics or moral philosophy is a branch of philosophy that "involves systematizing, defending, and recommending concepts of right and wrong behavior".''Internet Encyclopedia of Philosophy'' The field of ethics, along with aesthetics, concerns ma ...
and
decision theory
Decision theory (or the theory of choice; not to be confused with choice theory) is a branch of applied probability theory concerned with the theory of making decisions based on assigning probabilities to various factors and assigning numerical ...
. The logical properties that preferences possess have major effects also on
rational choice theory
Rational choice theory refers to a set of guidelines that help understand economic and social behaviour. The theory originated in the eighteenth century and can be traced back to political economist and philosopher, Adam Smith. The theory postula ...
, which has a carryover effect on all modern economic topics.
Using the
scientific method
The scientific method is an empirical method for acquiring knowledge that has characterized the development of science since at least the 17th century (with notable practitioners in previous centuries; see the article history of scientific m ...
, social scientists try to model how people make practical decisions in order to test predictions about human behavior. Although economists are usually not interested in what causes a person to have certain preferences, they are interested in the theory of choice because it gives a background to empirical
demand
In economics, demand is the quantity of a good that consumers are willing and able to purchase at various prices during a given time. The relationship between price and quantity demand is also called the demand curve. Demand for a specific item ...
analysis.
Stability of preference is a deep assumption behind most
economic model
In economics, a model is a theoretical construct representing economic processes by a set of variables and a set of logical and/or quantitative relationships between them. The economic model is a simplified, often mathematical, framework desig ...
s.
Gary Becker
Gary Stanley Becker (; December 2, 1930 – May 3, 2014) was an American economist who received the 1992 Nobel Memorial Prize in Economic Sciences. He was a professor of economics and sociology at the University of Chicago, and was a leader of ...
drew attention to this with his remark that "
e combined assumptions of
maximizing behavior,
market equilibrium
In economics, economic equilibrium is a situation in which economic forces such as supply and demand are balanced and in the absence of external influences the ( equilibrium) values of economic variables will not change. For example, in the st ...
, and stable preferences, used relentlessly and unflinchingly, form the heart of the economic approach as I see it."
More complex conditions of adaptive preference were explored by
Carl Christian von Weizsäcker in his paper "The Welfare Economics of Adaptive Preferences" (2005), while remarking that.
Traditional
neoclassical economics
Neoclassical economics is an approach to economics in which the production, consumption and valuation (pricing) of goods and services are observed as driven by the supply and demand model. According to this line of thought, the value of a good ...
has worked with the assumption that the preferences of agents in the economy are fixed. This assumption has always been disputed outside neoclassical economics.
History
In 1926,
Ragnar Frisch
Ragnar Anton Kittil Frisch (3 March 1895 – 31 January 1973) was an influential Norwegian economist known for being one of the major contributors to establishing economics as a quantitative and statistically informed science in the early 20th ce ...
was the first to develop a mathematical model of preferences in the context of economic demand and utility functions.
[ Barten, Anton and Volker Böhm. (1982). "Consumer theory", in Kenneth Arrow and Michael Intrilligator (eds.) ''Handbook of mathematical economics. Vol. II'', p. 384] Up to then, economists had used an elaborate theory of demand that omitted ''primitive characteristics'' of people. This omission ceased when, at the end of the 19th and the beginning of the 20th century,
logical positivism
Logical positivism, later called logical empiricism, and both of which together are also known as neopositivism, is a movement in Western philosophy whose central thesis was the verification principle (also known as the verifiability criterion o ...
predicated the need to relate theoretical concepts to observables.
[Gilboa, Itzhak. (2009)]
''Theory of Decision under uncertainty''
. Cambridge: Cambridge university press Whereas economists in the 18th and 19th centuries felt comfortable theorizing about utility, with the advent of logical positivism in the 20th century, they felt they needed a more empirical structure. Because
binary choices are directly observable, they instantly appeal to economists. The search for observables in microeconomics is taken even further by the
revealed preference theory
Revealed preference theory, pioneered by economist Paul Anthony Samuelson in 1938, is a method of analyzing choices made by individuals, mostly used for comparing the influence of policies on consumer behavior. Revealed preference models assume t ...
, which holds consumers' preferences can be revealed by what they purchase under different circumstances, particularly under different income and price circumstances.
[Roper, James and Zin, David. (2008). "A Note on the Pure Theory of Consumer's Behaviour"]
Despite utilitarianism and decision theory, many economists have differing definitions of what a
rational agent
A rational agent or rational being is a person or entity that always aims to perform optimal actions based on given premises and information. A rational agent can be anything that makes decisions, typically a person, firm, machine, or software.
Th ...
is. In the 18th century, utilitarianism gave insight into the utility-maximizing versions of rationality; however, economists still have no consistent definition or understanding of what preferences and rational actors should be analyzed.
Since the pioneer efforts of Frisch in the 1920s, the representability of a preference structure with a real-valued function is one of the major issues pervading the theory of preferences. This has been achieved by mapping it to the mathematical index called ''utility''.
Von Neumann Von Neumann may refer to:
* John von Neumann (1903–1957), a Hungarian American mathematician
* Von Neumann family
* Von Neumann (surname), a German surname
* Von Neumann (crater), a lunar impact crater
See also
* Von Neumann algebra
* Von Ne ...
and
Morgenstern's 1944 book
"Games and Economic Behaviour" treated preferences as a formal relation whose properties can be stated axiomatically. These types of axiomatic handling of preferences soon began to influence other economists: Marschak adopted it by 1950, Houthakker employed it in a 1950 paper, and Kenneth Arrow perfected it in his 1951 book "Social Choice and Individual Values".
Gérard Debreu, influenced by the ideas of the
Bourbaki group
Nicolas Bourbaki () is the collective pseudonym of a group of mathematicians, predominantly French alumni of the École normale supérieure - PSL (ENS). Founded in 1934–1935, the Bourbaki group originally intended to prepare a new textbook in ...
, championed the axiomatization of consumer theory in the 1950s, and the tools he borrowed from the mathematical field of binary relations have become mainstream since then. Even though the economics of choice can be examined either at the level of utility functions or at the level of preferences, moving from one to the other can be useful. For example, shifting the conceptual basis from an abstract preference relation to an abstract utility scale results in a new mathematical framework, allowing new conditions on the preference structure to be formulated and investigated.
Another historical turning point can be traced back to 1895, when
Georg Cantor
Georg Ferdinand Ludwig Philipp Cantor ( , ; – January 6, 1918) was a German mathematician. He played a pivotal role in the creation of set theory, which has become a fundamental theory in mathematics. Cantor established the importance of ...
proved in a theorem that if a binary relation is ''linearly ordered'', then it is also isomorphic in the ordered real numbers. This notion would become very influential for the theory of preferences in economics: by the 1940s, prominent authors such as
Paul Samuelson
Paul Anthony Samuelson (May 15, 1915 – December 13, 2009) was an American economist who was the first American to win the Nobel Memorial Prize in Economic Sciences. When awarding the prize in 1970, the Swedish Royal Academies stated that he "h ...
would theorize about people having weakly ordered preferences.
Historically, preference in economics as a form of utility can be categorized as ordinal or cardinal data. Both introduced in the 20th century, cardinal and ordinal utility take opposing theories and mindsets in applying and analysing preference in utility. Vilfredo Pareto introduced the concept of ordinal utility, while Carl Menger led the idea of cardinal utility. Ordinal utility, in summation, is the direct following of preference, where an optimal choice is taken over a set of parameters. A person is expected to act in their best interests and dedicate their preference to the outcome with the greatest utility. Ordinal utility assumes that an individual will not have the same utility from a preference as any other individual because they likely will not experience the same parameters which cause them to decide a given outcome. Cardinal utility is a function of utility where a person makes a decision based on a preference, and the preference decision is weighted based on a quantitative value of utility. This utility unit is assumed to be universally applicable and constant across all individuals. Cardinal utility also assumes consistency across individuals' decision-making processes, assuming all individuals will have the same preference, with all variables held constant. Marshall found that “a good deal of the analysis of consumer behavior could be greatly simplified by assuming that the marginal utility of income is constant” (Robert H. Strotz.), however, this cannot be held to the utility of resources and decision-making applied to income. Ordinal and cardinal utility theory provide unique viewpoints on utility, can be used differently to model decision-making preferences and utilization development, and can be used across many applications for economic analysis.
Notation
There are two fundamental comparative value concepts, namely strict preference (better) and indifference (equal in value to). These two concepts are expressed in terms of an agent's best wishes; however, they also express objective or intersubjectively valid superiority that does not coincide with the pattern of wishes of any person.
Suppose the set of all states of the world is
and an agent has a preference relation on
. It is common to mark the weak preference relation by
, so that
means "the agent wants y at least as much as x" or "the agent weakly prefers y to x".
The symbol
is used as a shorthand to denote an indifference relation:
, which reads "the agent is indifferent between y and x", meaning they receive the same level of benefit from each.
The symbol
is used as a shorthand to the strong preference relation:
, which reads "the agent strictly prefers y to x", meaning they perceive y as better than x.
Axiom of order (
completeness):
In terms of preference, completeness means that when a consumer is choosing between two different options, the consumer can rank them so either, A is preferred to B, B is preferred to A, or they are indifferent between the two.
For all
and
we have
or
or
.
Without completeness of preferences, consumers would not be able to come to a decision when given multiple options, as they wouldn't be able to rank them. Making
completeness a necessity for the decision model.
For preference theory to be useful mathematically, we need to assume the axiom of continuity. Continuity means that there are no ‘jumps’ in people's preferences. In mathematical terms, if we prefer point A along a preference curve to point B, points very close to A will also be preferred to B. This allows preference curves to be differentiated. The continuity assumption is "stronger than needed" because it guarantees the existence of a ''continuous utility function'' representation. Continuity is, therefore, a sufficient condition, but not a necessary one, for a system of preferences.
Although commodity bundles come in discrete packages, economists treat their units as a continuum because very little is gained from recognizing their discrete nature, the two approaches are reconcilable by this rhetorical device: When a consumer makes repeated purchases of a product, the commodity spaces can get converted from the discrete items to the time rates of consumption. Instead of noting that a consumer purchased one loaf of bread on Monday, another on Friday, and another the following Tuesday, we can speak of an average bread consumption rate equal to 7/4 loaves per week. There is no reason why the average consumption per week cannot be any real number, thus allowing differentiability of the consumer's utility function. We can speak of continuous ''services of goods'', even if purchased in discrete units.
Although some authors include
reflexivity as one of the axioms required to obtain representability (this axiom states that
), it is redundant inasmuch as the completeness axiom implies it already.
Non-satiation of Preferences
![Non-Satiated preferences with oranges](https://upload.wikimedia.org/wikipedia/commons/3/3d/Non-Satiated_preferences_with_oranges...jpg)
Non-satiation refers to the belief any commodity bundle with at least as much of one good and more of the other must provide a higher utility, showing that more is always regarded as "better". This assumption is believed to hold as when consumers are able to discard excess goods at no cost, then consumers can be no worse off with extra goods. This assumption does not preclude diminishing marginal utility.
Example
Option A
* Apple = 5
* Orange = 3
* Banana = 2
Option B
* Apple = 6
* Orange = 4
* Banana = 2
In this situation, utility from Option B > A, as it contains more apples and oranges with bananas being constant.
Transitivity
Transitivity of preferences is a fundamental principle shared by most major contemporary rational, prescriptive, and descriptive models of decision-making.
Arguably the most discussed logical property of preferences is the following:
A≽B ∧ B≽C → A≽C (transitivity of weak performance)
A∼B ∧ B∼C → A∼C (transitivity of indifference)
A≻B ∧ B≻C → A≻C (transitivity of strict preference)
In order to have transitivity preferences, a person, player, or agent that prefers choice option B to A and A to F must prefer B to F. Claims of violations of transitivity by any decision maker (in particular individuals) requires evidence beyond any reasonable doubt, with the onus placed on the individual.
When transitivity does not hold, it results in an endless loop of indecision, as the agent will always have an outcome that is preferred no matter their choice. This is why the assumption of transitivity preference is believed to hold in most situations. Transitivity is one of the prerequisites for a rational consumer in the market.
Most commonly used axioms
* Order-theoretic: acyclicity, the semi-order property, completeness
* Topological: continuity, openness, or closeness of the preference sets
* Linear-space:
convexity
Convex or convexity may refer to:
Science and technology
* Convex lens, in optics
Mathematics
* Convex set, containing the whole line segment that joins points
** Convex polygon, a polygon which encloses a convex set of points
** Convex polytope ...
, homogeneity
Normative interpretations of the axioms
Everyday experience suggests that people at least talk about their preferences as if they had personal "standards of judgment" capable of being applied to the particular domain of alternatives that present themselves from time to time.
[Shapley, Lloyd and Martin Shubik. (1974). "Game theory in economics". RAND Report R-904/4] Thus, the axioms attempt to model the decision maker's preferences, not over the actual choice, but over the type of desirable procedure (a procedure that any human being would like to follow).
Behavioral economics investigates human behavior which violates the above axions. Believing in axioms in a normative way does not imply that everyone must behave according to them.
Consumers whose preference structures violate transitivity would get exposed to being exploited by some unscrupulous person. For instance, Maria prefers apples to oranges, oranges to bananas, and bananas to apples. Let her be endowed with an apple, which she can trade in a market. Because she prefers bananas to apples, she is willing to pay one cent to trade her apple for a banana. Afterwards, Maria is willing to pay another cent to trade her banana for an orange, the orange for an apple, and so on. There are
other examples of this kind of irrational behavior.
Completeness implies that some choice will be made, an assertion that is more philosophically questionable. In most applications, the set of consumption alternatives is infinite, and the consumer is unaware of all preferences. For example, one does not have to choose between going on holiday by plane or train. Suppose one does not have enough money to go on holiday anyway. In that case, it is unnecessary to attach a preference order to those alternatives (although it can be nice to dream about what one would do if one wins the lottery). However, preference can be interpreted as a hypothetical choice that could be made rather than a conscious state of mind. In this case, completeness amounts to an assumption that the consumers can always make up their minds whether they are indifferent or prefer one option when presented with any pair of options.
Under some extreme circumstances, there is no "rational" choice available. For instance, if asked to choose which one of one's children will be killed, as in
Sophie's Choice
''Sophie's Choice'' may refer to:
* ''Sophie's Choice'' (novel), a 1979 novel by American author William Styron
** ''Sophie's Choice'' (film), a 1982 American drama film directed by Alan J. Pakula
** ''Sophie's Choice'' (opera), an opera by the ...
, there is no rational way out of it. In that case, preferences would be incomplete since "not being able to choose" is not the same as "being indifferent".
The ''indifference relation'' ~ is an
equivalence relation
In mathematics, an equivalence relation is a binary relation that is reflexive, symmetric and transitive. The equipollence relation between line segments in geometry is a common example of an equivalence relation.
Each equivalence relation ...
. Thus, we have a
quotient set
In mathematics, when the elements of some set S have a notion of equivalence (formalized as an equivalence relation), then one may naturally split the set S into equivalence classes. These equivalence classes are constructed so that elements a ...
S/~ of
equivalence class
In mathematics, when the elements of some set S have a notion of equivalence (formalized as an equivalence relation), then one may naturally split the set S into equivalence classes. These equivalence classes are constructed so that elements a ...
es of S, which forms a
partition
Partition may refer to:
Computing Hardware
* Disk partitioning, the division of a hard disk drive
* Memory partition, a subdivision of a computer's memory, usually for use by a single job
Software
* Partition (database), the division of a ...
of S. Each equivalence class is a set of packages that are equally preferred. If there are only two commodities, the equivalence classes can be graphically represented as
indifference curves.
Based on the preference relation on S, we have a preference relation on S/~. As opposed to the former, the latter is
antisymmetric and a
total order
In mathematics, a total or linear order is a partial order in which any two elements are comparable. That is, a total order is a binary relation \leq on some set X, which satisfies the following for all a, b and c in X:
# a \leq a ( reflexive) ...
.
Factors which affect consumer preferences
Indifference curve
An indifference curve is so named because the consumer would be indifferent between choosing any commodity bundles.
[University of Southern Indiana. (2021). Retrieved 26 April 2021, from https://www.usi.edu/business/cashel/331/CONSUMER.pdf] Indifference Curves explain an agent's behavior in terms of their preferences for different combinations of two goods, for example, X & Y. An indifference curve can be detected in a market when the economics of scope is not overly diverse, or the goods and services are a part of a perfect market. Any bundles on the same indifference curve have the same utility level. One example of this is deodorant. Deodorant is similarly priced throughout several different brands. Deodorant also has no major differences in use; therefore, consumers have no preference in what they should use. Indifference curves are negatively sloped because of the non-satiation of preferences, as consumers cannot be indifferent between two bundles if one has more of both goods. The indifference curves are also curved inwards due to
diminishing marginal utility
In economics, utility is the satisfaction or benefit derived by consuming a product. The marginal utility of a good or service describes how much pleasure or satisfaction is gained by consumers as a result of the increase or decrease in consumpti ...
, i.e., the reduction in the utility of every additional unit as consumers consume more of the same good. The slope of the indifference curve measures the
marginal rate of substitution
In economics, the marginal rate of substitution (MRS) is the rate at which a consumer can give up some amount of one good in exchange for another good while maintaining the same level of utility. At equilibrium consumption levels (assuming no exte ...
, which can be defined as the number of units of one good needed to replace one unit of another good without changing the overall utility.
Changes in new technology
New changes in technology are a big factor in changes of consumer preferences. When an industry has a new competitor who has found ways to make the goods or services work more effectively, it can change the market completely. An example of changes in technology is Android phones. Some years ago, Android struggled to compete with Apple for market share. With the advances in technology throughout the last five years, they have passed the stagnant apple brand. Changes in technology examples are but are not limited to increased efficiency, longer-lasting batteries, and a new easier interface for consumers.
Social influence
Changes in preference can also develop as a result of social interactions among consumers. If decision-makers are asked to make choices in isolation, the results may differ from those if they were to make choices in a group setting. By means of social interactions, individual preferences can evolve without any necessary change to the utility. This can be exemplified by taking the example of a group of friends having lunch together. Individuals in such a group may change their food preferences after being exposed to their friends' preferences. Similarly, if an individual tends to be risk-averse but is exposed to a group of risk-seeking people, his preferences may change over time.
Types of preferences
Convex preferences In economics, convex preferences are an individual's ordering of various outcomes, typically with regard to the amounts of various goods consumed, with the property that, roughly speaking, "averages are better than the extremes". The concept roughly ...
Convex preferences relate to averages between two points on an indifference curve. It comes in two forms, weak and strong. In its weak form, convex preferences states that if
. Then the average of A and B is at least as good as A. In contrast, the average of A and B would be preferred in its strong form. This is why in its strong form, the indifference line curves in, meaning that the average of any two points would result in a point further away from the origin, thus giving a higher utility. One way to check convexity is to connect two random points on the same indifference curve and draw a straight line through these two points, and then pick one point on the straight line between those two points. If the utility level of the picked point on the straight line is greater than that of those two points, this is a strictly convex preference. Convexity is one of the prerequisites for a rational consumer in the market when maximizing his utility level under the budget constraint.
Concave preferences
Concave preferences is the opposite of convex, where when
, then the average of A and B is worse than A. This is because concave curves slope outwards, meaning an average between two points on the same indifference curve would result in a point closer to the origin, thus giving a lower utility. To determine whether the preference is concave or not, one way is still to connect two random points on the same difference curve and draw a straight line through these two points, and then pick one point on the straight line between those two points. If the utility level of the picked point on the straight line is lower than that of those two points, this is a strictly concave preference.
Straight line indifference
Straight line similarities occur when there are perfect substitutes. Perfect substitutes are goods and/or services that can be used the same way as the good or service it replaces. When
, the average of A and B will fall on the same indifference line and give the same utility.
Types of goods affecting preferences
When a consumer is faced with a choice between different goods, the type of goods they are choosing between will affect how they make their decision process. To begin with, when there are
normal good
In economics, a normal good is a type of a good which experiences an increase in demand due to an increase in income, unlike inferior goods, for which the opposite is observed. When there is an increase in a person's income, for example due to a w ...
s, these goods have a direct correlation with the income the consumer makes, meaning as they make more money, they will choose to consume more of this good, and as their income decreases, they will consume less of the good. However, the opposite is
inferior good
In economics, an inferior good is a good whose demand decreases when consumer income rises (or demand increases when consumer income decreases), unlike normal goods, for which the opposite is observed. Normal goods are those goods for which the ...
s; these negatively correlate with income. Hence, as consumers make less money, they'll consume more inferior goods as they are seen as less desirable, meaning they come with a reduced cost. As they make more money, they'll consume less inferior goods and have the money available to buy more desirable goods. An example of a normal good would be branded clothes, as they are more expensive compared to their inferior good counterparts which are non-branded clothes. Goods that are not affected by income as referred to as a
necessity good In economics, a necessity good or a necessary good is a type of normal good.
Necessity goods are product(s) and services that consumers will buy regardless of the changes in their income levels, therefore making these products less sensitive to inc ...
, which are product(s) and services that consumers will buy regardless of the changes in their income levels. These usually include medical care, clothing and basic food. Finally, there are also
luxury goods
In economics, a luxury good (or upmarket good) is a good for which demand increases more than what is proportional as income rises, so that expenditures on the good become a greater proportion of overall spending. Luxury goods are in contrast to n ...
, which are the most expensive and deemed the most desirable. Just like normal goods, as income increases, so is the demand for luxury goods; however, in the case of luxury goods, the greater the income, the greater the demand for luxury goods.
Applications to theories of utility
In economics, a utility function is often used to represent a preference structure such that
if and only if
In logic and related fields such as mathematics and philosophy, "if and only if" (shortened as "iff") is a biconditional logical connective between statements, where either both statements are true or both are false.
The connective is bicondi ...
. The idea is to associate each class of indifference with a real number such that if one class is preferred to the other, then the number of the first one is greater than that of the second one. When a preference order is both transitive and complete, it is standard practice to call it a ''rational preference relation'', and the people who comply with it are ''
rational agent
A rational agent or rational being is a person or entity that always aims to perform optimal actions based on given premises and information. A rational agent can be anything that makes decisions, typically a person, firm, machine, or software.
Th ...
s''. A transitive and complete relation is called a
''weak order'' (or ''total preorder''). The literature on preferences is far from being standardized regarding terms such as ''complete'', ''partial'', ''strong'', and ''weak''. Together with the terms "total", "linear", "strong complete", "quasi-orders", "pre-orders", and "sub-orders", which also have different meanings depending on the author's taste, there has been an abuse of semantics in the literature.
According to Simon Board, a
continuous
Continuity or continuous may refer to:
Mathematics
* Continuity (mathematics), the opposing concept to discreteness; common examples include
** Continuous probability distribution or random variable in probability and statistics
** Continuous ...
utility function always exists if
is a continuous rational preference relation on
.
For any such preference relation, there are many continuous utility functions that represent it. Conversely, every utility function can be used to construct a unique preference relation.
All the above is independent of the prices of the goods and services and the budget constraints consumers face. These determine the ''feasible'' bundles (which they can afford). According to the standard theory, consumers choose a bundle within their budget such that no other feasible bundle is preferred over it, thus maximizing their utility.
Primitive equivalents of some known properties of utility functions
* An increasing utility function is associated with a
monotonic
In mathematics, a monotonic function (or monotone function) is a function between ordered sets that preserves or reverses the given order. This concept first arose in calculus, and was later generalized to the more abstract setting of ord ...
preference relation.
*
Quasi-concave utility functions are associated with a
convex preference order. When non-convex preferences arise, the
Shapley–Folkman lemma
The Shapley–Folkman lemma is a result in convex geometry that describes the Minkowski addition of sets in a vector space. It is named after mathematicians Lloyd Shapley and Jon Folkman, but was first published by the economist Ross ...
is applicable.
Lexicographic preferences
Lexicographic preferences In economics, lexicographic preferences or lexicographic orderings describe comparative preferences where an agent prefers any amount of one good (X) to any amount of another (Y). Specifically, if offered several bundles of goods, the agent will ch ...
are a special case of preferences that assign an infinite value to a good when compared with the other goods of a bundle.
Georgescu-Roegen pointed out that the measurability of the utility theory is limited as it excludes lexicographic preferences. Causing an amplified level of awareness placed upon lexicographic preferences as a substitute hypothesis on consumer behaviour.
Strict versus weak
The possibility of defining a strict preference relation
as distinguished from the weaker one
, and vice versa, suggests in principle an alternative approach of starting with the strict relation
as the primitive concept and deriving the weaker one and the indifference relation. However, an indifference relation derived this way will generally not be transitive.
The conditions to avoid such inconsistencies were studied in detail by
Andranik Tangian
Andranik Semovich Tangian (Melik-Tangyan) (Russian: Андраник Семович Тангян (Мелик-Тангян)); born March 29, 1952) is a Soviet Armenian-German mathematician, political economist and music theorist. Tangian is known ...
.
According to Kreps "beginning with strict preference makes it easier to discuss non-comparability possibilities".
[Kreps, David. (1990). ''A Course in Microeconomic Theory''. New Jersey: Princeton University Press]
Elicitation of preferences
The mathematical foundations of most common types of preferences — that are representable by quadratic or additive utility functions — laid down by
Gérard Debreu
enabled
Andranik Tangian
Andranik Semovich Tangian (Melik-Tangyan) (Russian: Андраник Семович Тангян (Мелик-Тангян)); born March 29, 1952) is a Soviet Armenian-German mathematician, political economist and music theorist. Tangian is known ...
to develop methods for their elicitation.
In particular, additive and quadratic preference functions in
variables can be constructed from interviews, where questions are aimed at tracing totally
2D-indifference curves in
coordinate planes.
Criticism
Some critics say that rational theories of choice and preference theories rely too heavily on the assumption of invariance, which states that the relation of preference should not depend on the description of the options or on the method of elicitation. But without this assumption, one's preferences cannot be represented as maximization of utility.
Milton Friedman said that segregating taste factors from objective factors (i.e. prices, income, availability of goods) is conflicting because both are "inextricably interwoven".
The non-satiation of preferences is another topic that generates debate since it essentially states that "more is better than less." Many argue that this interpretation is flawed and highly subjective. Many critics call for a specification of preference to be able to interpret the non-satiation principle reasonably. For example, in cases where there is a choice between more pollution and less pollution, consumers would rationally prefer less pollution thus making the non-satiation principle fail. Similar conflicts with the principle can be seen in choices that involve bulky goods in a limited space, such as an excess of furniture in a small house.
The concept of transitivity is highly debated, with many examples suggesting that it does not generally hold. One of the most well-known is the
Sorites paradox
The sorites paradox (; sometimes known as the paradox of the heap) is a paradox that results from vague predicates. A typical formulation involves a heap of sand, from which grains are removed individually. With the assumption that removing a sing ...
, which shows that indifference between small changes in value can be incrementally extended to indifference between large changes in values.
Another criticism comes from philosophy. Philosophers cast doubt that when most consumers share the same preference in the same market, which may lead to the result that the shared preference has become somewhat objective, whether the judgements of preferences for each individual will still depend on subjectivity or not.
See also
References
{{DEFAULTSORT:Preference (Economics)
Microeconomics
Utility