Indetermination and the Nash method The two famous papers published by John F. Nash in 1950 constitute one of the most remarkable contribution to economics in the history of this discipline. The concept of Nash solution cuts for the first time the Gordian knot of the indetermination problem while the concept of Nash equilibrium overtakes the von Neumann program of non cooperative games. These two contributions are very popular but the most important Nash's contribution to the economic theory is also less well-known: the Nash program. With this method, Nash offers to game theorists a methodology to build new models with respect to both cooperative and non cooperative approaches. And last but not least, Nash's PhD dissertation appears as a s...