title: Phase transition and symmetry breaking in the minority game.
abstract: We show that the minority game, a model of interacting heterogeneous agents, can be described as a spin system and displays a phase transition between a symmetric phase and a symmetry broken phase where the game's outcome is predictable. As a result a "spontaneous magnetization" arises in the spin formalism.
authors.affiliation: Institut de Physique Théorique, Université de Fribourg, CH-1700 Fribourg, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Challet
authors.forename: M
authors.initials: M
authors.lastname: Marsili