In economics, the marginal utility of a good or service is the utility gained (or lost) from an increase (or decrease) in the consumption of that good or service. Economists sometimes speak of a law of diminishing marginal utility, meaning that the first unit of consumption of a good or service yields more utility than the second and subsequent units.
The concept of marginal utility played a crucial role in the marginal revolution of the late 19th century, and led to the replacement of the labor theory of value by neoclassical value theory in which the relative prices of goods and services are simultaneously determined by marginal rates of substitution in consumption and marginal rates of transformation in production, which are equal in economic equilibrium.
- 1 Marginality
- 2 Utility
- 3 Diminishing marginal utility
- 4 Marginalist theory
- 5 Quantified marginal utility
- 6 History
- 7 See also
- 8 References
The term marginal refers to a small change, starting from some baseline level. As Philip Wicksteed explained the term,
- "Marginal considerations are considerations which concern a slight increase or diminution of the stock of anything which we possess or are considering"
Frequently the marginal change is assumed to start from the endowment, meaning the total resources available for consumption (see Budget constraint). This endowment is determined by many things including physical laws (which constrain how forms of energy and matter may be transformed), accidents of nature (which determine the presence of natural resources), and the outcomes of past decisions made both by others and by the individual himself or herself.
For reasons of tractability, it is often assumed in neoclassical analysis that goods and services are continuously divisible. Under this assumption, marginal concepts, including marginal utility may be expressed in terms of differential calculus. Marginal utility can be defined as a measure of relative satisfaction gained or lost from an increase or decrease in the consumption of that good or service.
However, strictly speaking, the smallest relevant division may be quite large. Frequently, economic analysis concerns the marginal values associated with a change of one unit of a discrete good or service, such as a motor vehicle or a haircut.
Different concepts of utility underlie different theories in which marginal utility plays a role. It has been common among economists to describe utility as if it were quantifiable, that is, as if different levels of utility could be compared along a numerical scale. This has significantly affected the development and reception of theories of marginal utility. Concepts of utility that entail quantification allow familiar arithmetic operations, and further assumptions of continuity and differentiability greatly increase tractability.
Contemporary mainstream economic theory frequently defers metaphysical questions, and merely notes or assumes that preference structures conforming to certain rules can be usefully proxied by associating goods, services, or uses thereof with quantities, and defines “utility” as such a quantification.
Another conception is Benthamite philosophy, which equated usefulness with the production of pleasure and avoidance of pain, assumed subject to arithmetic operation. British economists, under the influence of this philosophy (especially by way of John Stuart Mill), viewed utility as “the feelings of pleasure and pain” and further as a “quantity of feeling” (emphasis added).
Though generally pursued outside of the mainstream methods, there are conceptions of utility that do not rely on quantification. For example, the Austrian school generally attributes value to the satisfaction of needs, and sometimes rejects even the possibility of quantification. It has been argued that the Austrian framework makes it possible to consider rational preferences that would otherwise be excluded.
In any standard framework, the same object may have different marginal utilities for different people, reflecting different preferences or individual circumstances.
Diminishing marginal utility
the utility which a person receives with the increase in the stock that he already had "The law of diminishing marginal utility is at the heart of the explanation of numerous economic phenomena, including time preference and the value of goods. . . . The law says, first, that the marginal utility of each (homogenous) unit decreases as the supply of units increases (and vice versa); second, that the marginal utility of a larger-sized unit is greater than the marginal utility of a smaller-sized unit (and vice versa). The first law denotes the law of diminishing marginal utility, the second law the law of increasing total utility."
An individual will typically be able to partially order the potential uses of a good or service. For example, a ration of water might be used to sustain oneself, a dog, or a rose bush. Say that a given person gives her own sustenance highest priority, that of the dog next highest priority, and lowest priority to the rose bush. In that case, if the individual has two rations of water, then the marginal utility of either of those rations is that of sustaining the dog. The marginal utility of a third unit would be that of watering the roses.
The notion that marginal utilities are diminishing across the ranges relevant to decision-making is called “the law of diminishing marginal utility” (and also known as a “Gossen's First Law”). However, it will not always hold. The case of the person, dog, and roses is one in which potential uses operate independently—there is no complementarity across the three uses. Sometimes an amount added brings things past a desired tipping point, or an amount subtracted causes them to fall short. In such cases, the marginal utility of a good or service might actually be increasing. For example:
- bed sheets, which up to some number may only provide warmth, but after that point may allow one to effect an escape by being tied together into a rope;
- tickets, for travel or theatre, where a second ticket might allow one to take a date on an otherwise uninteresting outing;
- dosages of antibiotics, where having too few pills would leave bacteria with greater resistance, but a full supply could effect a cure.
The fact that a tipping point may be reached does not imply that marginal utility will continue to increase indefinitely thereafter. For example, beyond some point, further doses of antibiotics would kill no pathogens at all, and might even become harmful to the body. Simply put, as the rate of commodity consumption increases, marginal utility decreases. If commodity consumption continues to rise, marginal utility at some point falls to zero, reaching maximum total utility. Further increase in consumption of units of commodities causes marginal utility to become negative; this signifies dissatisfaction.
Independence from presumptions of self-interested behavior
While the above example of water rations conforms to ordinary notions of self-interested behavior, the concept and logic of marginal utility are independent of the presumption that people pursue self-interest. For example, a different person might give highest priority to the rose bush, next highest to the dog, and last to himself. In that case, if the individual has three rations of water, then the marginal utility of any one of those rations is that of watering the person. With just two rations, the person is left unwatered and the marginal utility of either ration is that of watering the dog. Likewise, a person could give highest priority to the needs of one of her neighbors, next to another, and so forth, placing her own welfare last; the concept of diminishing marginal utility would still apply.
Marginalism explains choice with the hypothesis that people decide whether to effect any given change based on the marginal utility of that change, with rival alternatives being chosen based upon which has the greatest marginal utility.
Market price and diminishing marginal utility
If an individual has a stock or flow of a good or service whose marginal utility is less than would be that of some other good or service for which he or she could trade, then it is in his or her interest to effect that trade. Of course, as one thing is traded-away and another is acquired, the respective marginal gains or losses from further trades are now changed. On the assumption that the marginal utility of one is diminishing, and the other is not increasing, all else being equal, an individual will demand an increasing ratio of that which is acquired to that which is sacrificed. (One important way in which all else might not be equal is when the use of the one good or service complements that of the other. In such cases, exchange ratios might be constant.) If any trader can better his or her own marginal position by offering a trade more favorable to complementary traders, then he or she will do so.
In an economy with money, the marginal utility of a quantity is simply that of the best good or service that it could purchase.
Hence, the “law” of diminishing marginal utility provides an explanation for diminishing marginal rates of substitution and thus for the “laws” of supply and demand, as well as essential aspects of models of “imperfect” competition.
The paradox of water and diamonds
The “law” of diminishing marginal utility is said to explain the “paradox of water and diamonds”, most commonly associated with Adam Smith (though recognized by earlier thinkers). Human beings cannot even survive without water, whereas diamonds are mere ornamentation or engraving bits. Yet water had a very low price, and diamonds a very high price, by any normal measure. Marginalists explained that it is the marginal usefulness of any given quantity that determines its price, rather than the usefulness of a class or of a totality. For most people, water was sufficiently abundant that the loss or gain of a gallon would withdraw or add only some very minor use if any; whereas diamonds were in much more restricted supply, so that the lost or gained use would be much greater.
That is not to say that the price of any good or service is simply a function of the marginal utility that it has for any one individual nor for some ostensibly typical individual. Rather, individuals are willing to trade based upon the respective marginal utilities of the goods that they have or desire (with these marginal utilities being distinct for each potential trader), and prices thus develop constrained by these marginal utilities.
The “law” does not tell us such things as why diamonds are naturally less abundant on the earth than is water, but helps us to understand how this affects the value imputed to a given diamond and the price of diamonds in a market.
Quantified marginal utility
Under the special case in which usefulness can be quantified, the change in utility of moving from state S1 to state S2 is
Moreover, if S1 and S2 are distinguishable by values of just one variable which is itself quantified, then it becomes possible to speak of the ratio of the marginal utility of the change in to the size of that change:
Mainstream neoclassical economics will typically assume that
is well defined, and use “marginal utility” to refer to a partial derivative
and diminishing marginal utility is similarly taken to correspond to
The concept of marginal utility grew out of attempts by economists to explain the determination of price. The term “marginal utility”, credited to the Austrian economist Friedrich von Wieser by Alfred Marshall, was a translation of Wieser's term “Grenznutzen” (border-use).
external goods have a limit, like any other instrument, and all things useful are of such a nature that where there is too much of them they must either do harm, or at any rate be of no use
A great variety of economists concluded that there was some sort of inter-relationship between utility and rarity that effected economic decisions, and in turn informed the determination of prices.
Eighteenth-century Italian mercantilists, such as Antonio Genovesi, Giammaria Ortes, Pietro Verri, Marchese Cesare di Beccaria, and Count Giovanni Rinaldo Carli, held that value was explained in terms of the general utility and of scarcity, though they did not typically work-out a theory of how these interacted. In Della moneta (1751), Abbé Ferdinando Galiani, a pupil of Genovesi, attempted to explain value as a ratio of two ratios, utility and scarcity, with the latter component ratio being the ratio of quantity to use.
Anne Robert Jacques Turgot, in Réflexions sur la formation et la distribution de richesse (1769), held that value derived from the general utility of the class to which a good belonged, from comparison of present and future wants, and from anticipated difficulties in procurement.
Like the Italian mercantists, Étienne Bonnot, Abbé de Condillac, saw value as determined by utility associated with the class to which the good belong, and by estimated scarcity. In De commerce et le gouvernement (1776), Condillac emphasized that value is not based upon cost but that costs were paid because of value.
This last point was famously restated by the Nineteenth Century proto-marginalist, Richard Whately, who in Introductory Lectures on Political Economy (1832) wrote
It is not that pearls fetch a high price because men have dived for them; but on the contrary, men dive for them because they fetch a high price.
(Whatley's student Senior is noted below as an early marginalist.)
Marginalists before the Revolution
The first unambiguous published statement of any sort of theory of marginal utility was by Daniel Bernoulli, in “Specimen theoriae novae de mensura sortis”. This paper appeared in 1738, but a draft had been written in 1731 or in 1732. In 1728, Gabriel Cramer had produced fundamentally the same theory in a private letter. Each had sought to resolve the St. Petersburg paradox, and had concluded that the marginal desirability of money decreased as it was accumulated, more specifically such that the desirability of a sum were the natural logarithm (Bernoulli) or square root (Cramer) thereof. However, the more general implications of this hypothesis were not explicated, and the work fell into obscurity.
In “A Lecture on the Notion of Value as Distinguished Not Only from Utility, but also from Value in Exchange”, delivered in 1833 and included in Lectures on Population, Value, Poor Laws and Rent (1837), William Forster Lloyd explicitly offered a general marginal utility theory, but did not offer its derivation nor elaborate its implications. The importance of his statement seems to have been lost on everyone (including Lloyd) until the early 20th century, by which time others had independently developed and popularized the same insight.
In An Outline of the Science of Political Economy (1836), Nassau William Senior asserted that marginal utilities were the ultimate determinant of demand, yet apparently did not pursue implications, though some interpret his work as indeed doing just that.
In 1854, Hermann Heinrich Gossen published Die Entwicklung der Gesetze des menschlichen Verkehrs und der daraus fließenden Regeln für menschliches Handeln, which presented a marginal utility theory and to a very large extent worked-out its implications for the behavior of a market economy. However, Gossen's work was not well received in the Germany of his time, most copies were destroyed unsold, and he was virtually forgotten until rediscovered after the so-called Marginal Revolution.
The Marginal Revolution
- “Marginal revolution” redirects here. For the economics weblog, see Marginal Revolution (blog).
William Stanley Jevons first proposed the theory in “A General Mathematical Theory of Political Economy” (PDF), a paper presented in 1862 and published in 1863, followed by a series of works culminating in his book The Theory of Political Economy in 1871 that established his reputation as a leading political economist and logician of the time. Jevons' conception of utility was in the utilitarian tradition of Jeremy Bentham and of John Stuart Mill, but he differed from his classical predecessors in emphasizing that "value depends entirely upon utility", in particular, on "final utility upon which the theory of Economics will be found to turn." He later qualified this in deriving the result that in a model of exchange equilibrium, price ratios would be proportional to not only to ratios of "final degrees of utility" but costs of production.
Carl Menger presented the theory in Grundsätze der Volkswirtschaftslehre (translated as Principles of Economics) in 1871. Menger's presentation is peculiarly notable on two points. First, he took special pains to explain why individuals should be expected to rank possible uses and then to use marginal utility to decide amongst trade-offs. (For this reason, Menger and his followers are sometimes called “the Psychological School”, though they are more frequently known as “the Austrian School” or as “the Vienna School”.) Second, while his illustrative examples present utility as quantified, his essential assumptions do not. (Menger in fact crossed-out the numerical tables in his own copy of the published Grundsätze.) Menger also developed the law of diminishing marginal utility. Menger's work found a significant and appreciative audience.
Marie-Esprit-Léon Walras introduced the theory in Éléments d'économie politique pure, the first part of which was published in 1874 in a relatively mathematical exposition. Walras's work found relatively few readers at the time but was recognized and incorporated two decades later in the work of Pareto and Barone.
An American, John Bates Clark, is sometimes also mentioned. But, while Clark independently arrived at a marginal utility theory, he did little to advance it until it was clear that the followers of Jevons, Menger, and Walras were revolutionizing economics. Nonetheless, his contributions thereafter were profound.
The second generation
Although the Marginal Revolution flowed from the work of Jevons, Menger, and Walras, their work might have failed to enter the mainstream were it not for a second generation of economists. In England, the second generation were exemplified by Philip Henry Wicksteed, by William Smart, and by Alfred Marshall; in Austria by Eugen von Böhm-Bawerk and by Friedrich von Wieser; in Switzerland by Vilfredo Pareto; and in America by Herbert Joseph Davenport and by Frank A. Fetter.
There were significant, distinguishing features amongst the approaches of Jevons, Menger, and Walras, but the second generation did not maintain distinctions along national or linguistic lines. The work of von Wieser was heavily influenced by that of Walras. Wicksteed was heavily influenced by Menger. Fetter referred to himself and Davenport as part of “the American Psychological School”, named in imitation of the Austrian “Psychological School”. (And Clark's work from this period onward similarly shows heavy influence by Menger.) William Smart began as a conveyor of Austrian School theory to English-language readers, though he fell increasingly under the influence of Marshall.
Böhm-Bawerk was perhaps the most able expositor of Menger's conception. He was further noted for producing a theory of interest and of profit in equilibrium based upon the interaction of diminishing marginal utility with diminishing marginal productivity of time and with time preference. (This theory was adopted in full and then further developed by Knut Wicksell and, with modifications including formal disregard for time-preference, by Wicksell's American rival Irving Fisher.)
Marshall was the second-generation marginalist whose work on marginal utility came most to inform the mainstream of neoclassical economics, especially by way of his Principles of Economics, the first volume of which was published in 1890. Marshall constructed the demand curve with the aid of assumptions that utility was quantified, and that the marginal utility of money was constant (or nearly so). Like Jevons, Marshall did not see an explanation for supply in the theory of marginal utility, so he synthesized an explanation of demand thus explained with supply explained in a more classical manner, determined by costs which were taken to be objectively determined. (Marshall later actively mischaracterized the criticism that these costs were themselves ultimately determined by marginal utilities.)
The Marginal Revolution and Marxism
Karl Marx acknowledged that “nothing can have value, without being an object of utility”, but, in his analysis, “use-value as such lies outside the sphere of investigation of political economy”, with labor being the principal measure of value under capitalism.
The doctrines of marginalism and the Marginal Revolution are often interpreted as somehow a response to Marxist economics. In fact, the first volume of Das Kapital was not published until July 1867, after the works of Jevons, Menger, and Walras were written or well under way; and Marx was still a relatively obscure figure when these works were completed. It is unlikely that any of them knew anything of him. (On the other hand, Hayek or Bartley has suggested that Marx, voraciously reading at the British Museum, may have come across the works of one or more of these figures, and that his inability to formulate a viable critique may account for his failure to complete any further volumes of Kapital before his death.)
Nonetheless, it is not unreasonable to suggest that part of what contributed to the success of the generation who followed the preceptors of the Revolution was their ability to formulate straight-forward responses to Marxist economic theory. The most famous of these was that of Böhm-Bawerk, “Zum Abschluss des Marxschen Systems” (1896), but the first was Wicksteed's “The Marxian Theory of Value. Das Kapital: a criticism” (1884, followed by “The Jevonian criticism of Marx: a rejoinder” in 1885). Only a few Marxist replies were initially made to marginalism, of which the most famous were Rudolf Hilferding's Böhm-Bawerks Marx-Kritik (1904) and Политической экономии рантье (1914) by Никола́й Ива́нович Буха́рин (Nikolai Bukharin). However, over the course of the 20th century a considerable literature developed on the conflict between marginalism and the labour theory of value, with the work of the neo-Ricardian economist Piero Sraffa providing an important critique of marginalism.
In his 1881 work Mathematical Psychics, Francis Ysidro Edgeworth presented the indifference curve, deriving its properties from marginalist theory which assumed utility to be a differentiable function of quantified goods and services. Later work attempted to generalize to the indifference-curve formulations of utility and marginal utility in avoiding unobservable measures of utility.
In 1915, Евгений Евгениевич Слуцкий (Eugen Slutsky) derived a theory of consumer choice solely from properties of indifference curves. Because of the World War, the Bolshevik Revolution, and his own subsequent loss of interest, Slutsky's work drew almost no notice, but similar work in 1934 by John Richard Hicks and R. G. D. Allen derived much the same results and found a significant audience. (Allen subsequently drew attention to Slutsky's earlier accomplishment.)
Although some of the third generation of Austrian School economists had by 1911 rejected the quantification of utility while continuing to think in terms of marginal utility, most economists presumed that utility must be a sort of quantity. Indifference curve analysis seemed to represent a way of dispensing with presumptions of quantification, albeït that a seemingly arbitrary assumption (admitted by Hicks to be a “rabbit out of a hat”) about decreasing marginal rates of substitution would then have to be introduced to have convexity of indifference curves.
For those who accepted that indifference-curve analysis superseded earlier marginal-utility analysis, the latter became at best perhaps pedagogically useful, but “old fashioned” and observationally unnecessary.
When Cramer and Bernoulli introduced the notion of diminishing marginal utility, it had been to address a paradox of gambling, rather than the paradox of value. The marginalists of the revolution, however, had been formally concerned with problems in which there was neither risk nor uncertainty. So too with the indifference curve analysis of Slutsky, Hicks, and Allen.
The expected utility hypothesis of Bernoulli et alii was revived by various 20th century thinkers, with early contributions by Ramsey (1926), v. Neumann and Morgenstern (1944), and Savage (1954). Although this hypothesis remains controversial, it not only brings utility, but a quantified conception of utility, back into the mainstream of economic thought.
A major reason why quantified models of utility are influential today is that risk and uncertainty have been recognized as central topics in contemporary economic theory. Quantified utility models simplify the analysis of risky decisions because, under quantified utility, diminishing marginal utility implies “risk aversion”. In fact, many contemporary analyses of saving and portfolio choice require stronger assumptions than diminishing marginal utility, such as the assumption of “prudence”, which means convex marginal utility.
Meanwhile, the Austrian School continued to develop its ordinalist notions of marginal utility analysis, formally demonstrating that from them proceed the decreasing marginal rates of substitution of indifference curves.
- See also works named in body of article.
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- ^ a b Polleit, Thorsten (2011-02-11) What Can the Law of Diminishing Marginal Utility Teach Us?, Mises Institute
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- ^ Aristotle, Politics, Bk 7 Chapter 1.
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- ^ Bernoulli, Daniel; “Specimen theoriae novae de mensura sortis” in Commentarii Academiae Scientiarum Imperialis Petropolitanae 5 (1738); reprinted in translation as “Exposition of a new theory on the measurement of risk” in Econometrica 22 (1954).
- ^ Bernoulli, Daniel; letter of 4 July 1731 to Nicolas Bernoulli (excerpted in PDF).
- ^ Bernoulli, Nicolas; letter of 5 April 1732, acknowledging receipt of “Specimen theoriae novae metiendi sortem pecuniariam” (excerpted in PDF).
- ^ Cramer, Garbriel; letter of 21 May 1728 to Nicolaus Bernoulli (excerpted in PDF).
- ^ Seligman, Edwin Robert Anderson; “On some neglected British economists”, Economic Journal v. 13 (September 1903).
- ^ White, Michael V; “Diamonds Are Forever(?): Nassau Senior and Utility Theory” in The Manchester School of Economic & Social Studies 60 (1992) #1 (March).
- ^ Dupuit, Jules; “De la mesure de l’utilité des travaux publics”, Annales des ponts et chaussées, Second series, 8 (1844).
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- ^ W. Stanley Jevons (1879, 2nd ed.), The Theory of Political Economy, pp. 208.
- ^ R.D. Collison Brown (1987), "Jevons, William Stanley," The New Palgrave: A Dictionary of Economics, v. 2, pp. 1008-09.
- ^ Kauder, Emil; A History of Marginal Utility Theory (1965), p76.
- ^ Donald A. Walker (1987), "Walras, Léon" The New Palgrave: A Dictionary of Economics, v. 4, p. 862.
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- ^ Böhm-Bawerk, Eugen Ritter von. “Grundzüge der Theorie des wirtschaftlichen Güterwerthes”, Jahrbüche für Nationalökonomie und Statistik v 13 (1886). Translated as Basic Principles of Economic Value.
- ^ Böhm-Bawerk, Eugen Ritter von; Kapital Und Kapitalizns. Zweite Abteilung: Positive Theorie des Kapitales (1889). Translated as Capital and Interest. II: Positive Theory of Capital with appendices rendered as Further Essays on Capital and Interest.
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- ^ Буха́рин, Никола́й Ива́нович (Nikolai Ivanovich Bukharin); Политической экономии рантье (1914). Translated as The Economic Theory of the Leisure Class.
- ^ Gaffney, Mason, and Fred Harrison; The Corruption of Economics (1994).
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- ^ Hicks, Sir John Richard; Value and Capital, Chapter I. “Utility and Preference” §8, p23 in the 2nd edition.
- ^ a b Hicks, Sir John Richard; Value and Capital, Chapter I. “Utility and Preference” §7-8.
- ^ Samuelson, Paul Anthony; “Complementarity: An Essay on the 40th Anniversary of the Hicks-Allen Revolution in Demand Theory”, Journal of Economic Literature vol 12 (1974).
- ^ Ramsey, Frank Plumpton; “Truth and Probability” (PDF), Chapter VII in The Foundations of Mathematics and other Logical Essays (1931).
- ^ von Neumann, John and Oskar Morgenstern; Theory of Games and Economic Behavior (1944).
- ^ Savage, Leonard Jimmie; Foundations of Statistics (1954).
- ^ Diamond, Peter, and Michael Rothschild, eds.; Uncertainty in Economics (1989). Academic Press.
- ^ Demange, Gabriel, and Guy Laroque; Finance and the Economics of Uncertainty (2006), Ch. 3, pp. 71-72. Blackwell Publishing.
- ^ Kimball, Miles (1990), “Precautionary Saving in the Small and in the Large”, Econometrica, 58 (1) pp. 53-73.
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marginal utility — /ˌmɑ:dʒɪn(ə)l ju: tɪlɪti/ noun satisfaction gained from using one more unit of a product … Marketing dictionary in english
Law Of Diminishing Marginal Utility — A law of economics stating that as a person increases consumption of a product while keeping consumption of other products constant there is a decline in the marginal utility that person derives from consuming each additional unit of that product … Investment dictionary
law of diminishing marginal utility — Econ. the law that for a single consumer the marginal utility of a commodity diminishes for each additional unit of the commodity consumed. * * * … Universalium