Antoine Augustin Cournot

Antoine Augustin Cournot was a French philosopher and mathematician born on August 28, 1801. He studied at Collège de Gray, Collège Royal de Besançon, and the prestigious École normale supérieure. After earning a license in mathematics from Sorbonne University, he served as a private secretary, using the time for his own studies, eventually earning doctorates in mechanics and astronomy, and a law degree. He held positions as a professor of mathematics, chief examiner, and rector of Dijon Academy. Cournot died on March 31, 1877, nearly blind. In economics, Cournot was influential despite his primary identity as a mathematician. His 1838 book, 'Researches on Mathematical Principles of the Theory of Wealth,' introduced mathematical analysis to economic concepts such as monopolies and duopolies. Although not widely successful during his lifetime, it is now considered a foundational text for modern economic analysis. He pioneered the use of functions and probability in economics, derived the first supply and demand formula as a function of price, and was the first to use supply and demand curves on a graph, predating Alfred Marshall. His 'Cournot duopoly' model introduced the concepts of Nash equilibrium and reaction functions. Cournot believed mathematics should be used to establish probable limits and express facts in absolute terms, not necessarily with strict numerical precision. In philosophy, Cournot explored determinism and chance, defining randomness as the encounter of two independent causal series. This definition allowed for randomness even in deterministic events and is still relevant in generating random numbers.