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Léon Walras

Original nameLéon Walras

Founder of "general equilibrium" theory, father of mathematical economics

The First to Read "Where Wealth Comes From" · The Birth of Economics
General EquilibriumMathematical EconomicsMarginal RevolutionFrance

Who they are

A French economist, one of the three of the "marginal revolution," and the founder of modern mathematical economics. He put forward the far-reaching theory of "general equilibrium": treating the whole economy as one vast, interconnected network of markets, and using a set of simultaneous equations to describe how all goods and all markets reach supply-demand balance at once. This was humanity’s first attempt to depict the workings of an entire economic system with a rigorous mathematical model. Abstract as it is, it laid the foundation for the later mathematization of mainstream economics — much of the modeling in economics today traces back to Walras’s grand conception.

Primary sourcesWalras, Elements of Pure Economics

Key stories

Writing the Whole Economy as One Set of Equations

Walras had a staggering ambition: since the price of every good depends on all other goods, could one not solve for all prices and quantities of the whole economy at once with one great set of simultaneous equations? This "general equilibrium" conception is extremely abstract, yet for the first time made economics a science that, like physics, could be precisely described by mathematics. The mathematical skeleton of modern economics largely begins here.

Relationships

Ally
📊William Stanley Jevons　one of the three independent founders of the "marginal revolution"

Echoes today

Below are how modern works borrow or reinterpret this name or story — not the original material. The two differ, so keep them apart.

"General equilibrium" and the mathematization of economicsWalras’s general-equilibrium theory first depicted a whole economic system with simultaneous equations, and Schumpeter called him "the greatest economist"; the mathematical skeleton of modern mainstream economics largely springs from him.
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