title: Opinion formation model for markets with a social temperature and fear.
abstract: In the spirit of behavioral finance, we study the process of opinion formation among investors using a variant of the two-dimensional voter model with a tunable social temperature. Further, a feedback acting on the temperature is introduced, such that social temperature reacts to market imbalances and thus becomes time dependent. In this toy market model, social temperature represents nervousness of agents toward market imbalances representing speculative risk. We use the knowledge about the discontinuous generalized voter model phase transition to determine critical fixed points. The system exhibits metastable phases around these fixed points characterized by structured lattice states, with intermittent excursions away from the fixed points. The statistical mechanics of the model is characterized, and its relation to dynamics of opinion formation among investors in real markets is discussed.
authors.affiliation: Institut für Theoretische Physik, Universität Bremen, D-28359 Bremen, Germany. sebastian.krause@itp.uni-bremen.de
authors.forename: Sebastian M
authors.initials: SM
authors.lastname: Krause
authors.forename: Stefan
authors.initials: S
authors.lastname: Bornholdt
mesh_terms: D003198:Computer Simulation; D005239:Fear / Q000502:physiology* / Q000523:psychology*; D005716:Game Theory; D006801:Humans; D040541:Marketing / Q000379:methods*; D008954:Models, Biological; D015233:Models, Statistical; D012919:Social Behavior; D013696:Temperature