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Publicado en: Artículo en revista académica

Peer Effects and Peer Avoidance: The Diffusion of Behavior in Coevolving Networks

Constanza Fosco; Matteo Marsili; Fernando Vega-Redondo.

Journal of the European Economic Association 8 (1), 169-202

We study the long-run emergence of behavioral patterns in dynamic complex networks. Individuals can display two kinds of behavior: G “good” or B “bad”. We assume that the exposure of a G agent to bad behavior on the part of peers/neighbors triggers her own switch to B behavior, but only temporarily. We model the implications of such peer effects as an epidemic process in the standard SIS (SusceptibleInfected-Susceptible) framework. The key novelty of our model is that, unlike in the received literature, the network is taken to change over time within the same time scale as behavior. Speciffically, we posit that links connecting two G agents last longer, reflecting the idea that B agents tend to be avoided. The main concern of the paper is to understand the extent to which such biased network turnover may play a signifficant role in supporting G behavior in a social system. And indeed we Önd that network coevolution has nontrivial and interesting e§ects on long-run behavior. This yields fresh insights on the role of (endogenous) peer pressure on the di§usion of (a)social behavior and also has some bearing on the traditional study of disease epidemics.


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