Léon Walras (1834–1910)

Who They Were

Leon Walras (1834-1910) was a French economist who spent his career at the University of Lausanne, in Switzerland, where he founded what became known as the Lausanne school. He was one of three thinkers -- alongside William Stanley Jevons in England and Carl Menger in Austria -- who independently launched the Marginal Revolution of the early 1870s, relocating the source of economic value from labour to marginal utility. Jevons and Menger both published in 1871; Walras followed in 1874 with his Elements of Pure Economics. Where the others worked largely in words, Walras built a mathematical system, and his influence helped make formal, mathematical modelling a normal part of economic theory rather than an eccentricity.

Key Contributions

Walras is best known as the founder of general equilibrium theory. He asked whether every market in an economy could clear simultaneously -- whether prices exist at which supply equals demand in all markets at once -- and set out to answer it with systems of simultaneous equations. His Elements of Pure Economics (1874) turned that question into a formal mathematical framework, making simultaneous-equation systems a standard tool of economics rather than an oddity. Like Jevons and Menger, he grounded value in marginal utility, the benefit of one more unit, which declines as a person consumes more. His general-equilibrium vision became one of the central organising ideas of modern economic theory, later developed rigorously in the twentieth century by economists such as Kenneth Arrow and Gerard Debreu.

On EconRecall

Marginal revolutionary who founded general equilibrium theory and made mathematical modelling standard in economics. Play the games that feature Léon Walras:

• Match The Economist To Their Theory