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The Concise Encyclopedia of Economics: Leon Walras

Leon Walras: The Concise Encyclopedia of Economics | Library of Economics and Liberty eparately but almost simultaneously with , French economist Leon Walras developed the idea of marginal utility and is thus considered one of the founders of the “marginal revolution.” But Walras’s biggest contribution was in what is now called general equilibrium theory. Before Walras, economists had made little attempt to show how a whole economy with many goods fits together and reaches an equilibrium. Walras’s goal was to do this. He did not succeed, but he took some major first steps. First, he built a system of simultaneous equations to describe his hypothetical economy, a tremendous task, and then showed that because the number of equations equaled the number of unknowns, the system could be solved to give the equilibrium prices and quantities of commodities. The demonstration that price and quantity were uniquely determined for each commodity is considered one of Walras’s greatest contributions to economic science.

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