- (game theory) a stable state of a system that involves several interacting participants in which no participant can gain by a change of strategy as long as all the other participants remain ...

Holt, Charles A., and Alvin E. Roth. "The Nash Equilibrium: A Perspective." Proceedings of the National Academy of Sciences 101, no. 12 (March 23, 2004): 3999–4002.

In 1950, John Nash — the mathematician later featured in the book and film “A Beautiful Mind” — wrote a two-page paper that transformed the theory of economics. His crucial, yet utterly simple, idea ...