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William Stanley Jevons

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William Stanley Jevons (; 1 September 1835 – 13 August 1882) was an English economist and logician.

Irving Fisher described Jevons's book The Theory of Political Economy (1871) as the start of the mathematical method in economics. It made the case that economics, as a science concerned with quantities, is necessarily mathematical. In so doing, it expounded upon the "final" (marginal) utility theory of value. Jevons's work, along with similar discoveries made by Carl Menger in Vienna (1871) and by Léon Walras in Switzerland (1874), marked the opening of a new period in the history of economic thought. Jevons's contribution to the marginal revolution in economics in the late 19th century established his reputation as a leading political economist and logician of the time.

Jevons broke off his studies of the natural sciences in London in 1854 to work as an assayer in Sydney, where he acquired an interest in political economy. Returning to the UK in 1859, he issued a "Notice of a General Mathematical Theory of Political Economy" in 1862, outlining the marginal utility theory of value, and published A Serious Fall in the Value of Gold in 1863. For Jevons, the utility or value to a consumer of an additional unit of a product is inversely related to the number of units of that product he already owns, at least beyond some critical quantity.

Jevons received public recognition for his work on The Coal Question (1865), in which he called attention to the gradual exhaustion of Britain's coal supplies and also put forth the view that increases in energy production efficiency leads to more, not less, consumption. This view is known today as the Jevons paradox, named after him. Due to this particular work, Jevons is regarded today as the first economist of some standing to develop an 'ecological' perspective on the economy.

The most important of his works on logic and scientific methods is his Principles of Science (1874), as well as The Theory of Political Economy (1871) and The State in Relation to Labour (1882). Among his inventions was the logic piano, a mechanical computer.

Overview adapted from Wikipedia (CC BY-SA 4.0; see the article history for authors).

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When two things, though made by equal labor, are of unequal value because the one is called upon to yield profit for a greater number of years or months than the other, this difference of value will be greater when profits are greater, and less when they are less. The wine which has to yield five years’ profit more than the cloth will surpass it in value much more if profits are forty per cent than if they are only…
John Stuart Mill, Principles of Political Economy
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Yet those who know the habits of the continent of Europe are aware how apparently small a motive often outweighs the desire of money getting, even in the operations which have money getting for their direct object. The more highly the science of ethology is cultivated, and the better the diversities of individual and national character are understood, the smaller, probably, will the number of propositions become…
John Stuart Mill, A System of Logic, Ratiocinative and Inductive
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I shall only observe at present, that the high value of the precious metals can be no proof of the poverty or barbarism of any particular country at the time when it took place. It is a proof only of the barrenness of the mines which happened at that time to supply the commercial world.
Adam Smith, An Inquiry Into the Nature and Causes of the Wealth of Nations
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William Stanley Jevons

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