Francis Ysidro Edgeworth was originally named Ysidro Francis Edgeworth but transposed his forenames. He was the youngest of his parents five sons and. STIGLER – Francis Ysidro Edgeworth, Statistician [Part 3, the originator of index numbers and graphical displays, at least Jevons realized their potential. Francis Ysidro Edgeworth (–) was raised on the family estate of Edgeworthstown, County Longford, Ireland. His father died when Edgeworth was two.

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From onward, he was appointed the founding editor of The Economic Journal. Edgeworth was born in EdgeworthstownCounty LongfordIreland.

He did not attend school, but was educated by private tutors at the Edgeworthstown estate until he reached the age to enter university. His father, Francis Beaufort Edgeworth, was descended from French Huguenots and “was a restless philosophy student at Cambridge on his way to Germany when he decided to elope with a teenage Catalan refugee Rosa Florentina Eroles he met on ysixro steps of the British Museum.

One of the outcomes of their marriage was Ysidro Francis Edgeworth the name order was reversed later A voracious autodidact franvis, he studied mathematics and economics only after he had completed university. He qualified as a barrister in London in but did not franfis. On the basis of his publications in economics and mathematical statistics in the s, Edgeworth was appointed to a chair in economics at King’s College London inand inhe was appointed Drummond Professor of Political Economy edgewroth Oxford University.

Inhe was also appointed the founding editor of The Economic Journal. He continued as editor or joint-editor until his death 35 years later.

Edgeworth was a highly influential figure in the development of neo-classical economics. He was the first to apply certain formal mathematical techniques to individual decision making in economics. He developed utility theoryintroducing the indifference curve and the famous Edgeworth boxwhich is now familiar to undergraduate students of microeconomics. He is also known for the Edgeworth conjecturewhich states that the core of an economy shrinks to the set of competitive equilibria as the number of agents in the economy gets larger.

In statistics, Edgeworth is most prominently remembered by having his name on the Edgeworth series. His most original and creative book on economics was Mathematical Psychics: An Essay on the Application of Mathematics to the Moral Sciencespublished in at the beginning of his long career in the subject.

The book was notoriously difficult to read. He frequently referenced literary sources and interspersed the writing with passages in a number of languages, including LatinFrench and Ancient Greek.

The mathematics was similarly difficult, and a number of his creative applications of mathematics to economic or moral issues were judged as incomprehensible. However, one of the most influential economists of the time, Alfred Marshallcommented in his review of Mathematical Psychics: Edgeworth served as the president of the Royal Statistical Society, — InArthur Lyon Bowley published a book entitled and devoted to F. Edgeworth’s Contributions to Mathematical Statistics.

In Mathematical Psychicshis most famous and original book, he criticised Jevons’s theory of barter exchangeshowing that under a system of “recontracting” there will be, in fact, many solutions, an “indeterminacy of contract”.

Edgeworth’s “range of final settlements” was later resurrected by Martin Shubik as the game-theoretic concept of “the core”. As the number of agents in an economy increases, the degree of indeterminacy is reduced. In the limit case of an infinite number of agents perfect competitioncontract becomes fully determinate and identical to the ‘equilibrium’ of economists.

The only way of resolving rrancis indeterminacy of contract would be to appeal to the utilitarian principle of maximising the sum of the utilities of traders over the range of final settlements. Incidentally, it was franxis this book that Edgeworth introduced into economics the generalised utility function, U x, y, z, He franics the first one to use offer curves and community indifference curves to illustrate its main propositions, including the “optimal tariff “.

## Francis Ysidro Edgeworth

He set the utilitarian foundations for highly progressive taxation, arguing that the optimal distribution of taxes should be such that ‘the marginal disutility incurred by each taxpayer should be the same’ Edgeworth, Inin an article on monopoly pricing, Edgeworth criticised Cournot’s exact solution to the duopoly problem with quantity adjustments as well as Bertrand’s “instantly competitive” result in a duopoly model with price adjustment.

This gave rise to the Bertrand—Edgeworth model of oligopoly. Edgeworth criticised the marginal productivity theory in several articles, and tried to refine the neo-classical theory of distribution on a more solid basis. Although his work in questions of war finance during World War I was original, they were a bit too theoretical and did not achieve the practical influence he had hoped.

Edgeworth’s limit theorem relates to equilibrium of supply and demand in a free market. See Edgeworth’s limit theorem. Though Edgeworth’s edgewortu ideas were original and in depth, his contemporaries frequently complained of his manner ffrancis expression for lack of clarity. He was prone to verbosity and coining obscure words without providing definition for the reader.

From Wikipedia, the free encyclopedia. EdgeworthstownCounty LongfordIreland. OxfordOxfordshire, England. This means that he had successfully completed his studies at the professional level. However, by then he had decided not to pursue a legal career. Archived from the original on 10 August Retrieved 20 June Archived from the original on 9 February Retrieved 9 February See in particular Section 3, “Edgeworth’s Style”, pp.

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### Francis Ysidro Edgeworth: A Portrait with Family and Friends

Kendall Henry Daniels G. Sukhatme George E. Kelly Ysiddo Clayton R. Smith Robert Curnow A. Smith David Spiegelhalter B. William Gemmell Cochran R. Downton Robin Plackett M. Smith Philip Dawid T. Hendry Peter Green S.

## Edgeworth, Francis Ysidro

Gore Valerie Isham M. Jennison Jonathan Tawn R. Poultney Iain M. Matthews Gareth Roberts D. Presidents of the Royal Statistical Society. Bartholomew — Adrian Smith — R. Curnow — Denise Lievesley. Retrieved from ” https: Webarchive template wayback links CS1 maint: Views Read Edit View history.

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