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John Charles Harsanyi (Hungarian: Harsányi János Károly) (born May 29, 1920 in Budapest, Hungary; died August 9, 2000 in Berkeley, California, United States) was a Hungarian-Australian-American economist and Nobel Memorial Prize in Economic Sciences winner.
He is best known for his contributions to the study of game theory and its application to economics, specifically for his developing the highly innovative analysis of games of incomplete information, so-called Bayesian games. He also made important contributions to the use of game theory and economic reasoning in political and moral philosophy (specifically utilitarian ethics) as well as contributing to the study of equilibrium selection. For his work, he was a co-recipient along withJohn Nash and Reinhard Selten of the 1994 Nobel Memorial Prize in Economics.