Antoine Augustin Cournot (28 August 1801 – 31 March 1877) was a French philosopher and mathematician who also made important contributions to economic theory.

In 1838 he published the book *Researches on the Mathematical Principles of the Theory of Wealth* in which introduced the ideas of functions and probability into economic analysis. He derived the first formula for the rule of supply and demand as a function of price and in fact was the first to draw supply and demand curves on a graph, anticipating the work of Alfred Marshall by roughly thirty years.

The Cournot duopoly model developed in his book also introduced the concept of a (pure strategy) Nash equilibrium, the reaction function and best-response dynamics, anticipating Nash by more that a century.

Link to History of Economic Thought Website

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