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Social Influence, Binary Decisions and Collective Dynamics

Author

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  • Dunia López-Pintado

    (Department of Economics, Universidad Pablo de Olavide, Universidad Pablo de Olavide, Carretera Utrera Km. 1, Sevilla 41013 (Spain), dlopez@upo.es)

  • Duncan J. Watts

    (Yahoo! Research, 111 West 40th St., 17th Floor, New York, NY 10018, djw24@columbia.edu)

Abstract

In this paper we address the general question of how social influence determines collective outcomes for large populations of individuals faced with binary decisions. First, we define conditions under which the behavior of individuals making binary decisions can be described in terms of what we call an influence-response function: a one-dimensional function of the (weighted) number of individuals choosing each of the alternatives. And second, we demonstrate that, under the assumptions of global and anonymous interactions, general knowledge of the influence-response functions is sufficient to compute equilibrium, and even non-equilibrium, properties of the collective dynamics. By enabling us to treat in a consistent manner classes of decisions that have previously been analyzed separately, our framework allows us to find similarities between apparently quite different kinds of decision situations, and conversely to identify important differences between decisions that would otherwise appear very similar.

Suggested Citation

  • Dunia López-Pintado & Duncan J. Watts, 2008. "Social Influence, Binary Decisions and Collective Dynamics," Rationality and Society, , vol. 20(4), pages 399-443, November.
    • Handle: RePEc:sae:ratsoc:v:20:y:2008:i:4:p:399-443
    DOI: 10.1177/1043463108096787
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