Threshold Learning Dynamics in Social Networks
GONZÁLEZ-AVELLA, Juan Carlos; EGUÍLUZ, Victor M.; MARSILI, Matteo; VEGA-REDONDO, Fernando; SAN MIGUEL, Maxi
PLoS ONE, 2011, 6, 5, e20207
GONZÁLEZ-AVELLA, Juan Carlos, EGUÍLUZ, Victor M., MARSILI, Matteo, VEGA-REDONDO, Fernando, SAN MIGUEL, Maxi, Threshold Learning Dynamics in Social Networks, PLoS ONE, 2011, 6, 5, e20207 - http://hdl.handle.net/1814/21637
Retrieved from Cadmus, EUI Research Repository
Social learning is defined as the ability of a population to aggregate information, a process which must crucially depend on the mechanisms of social interaction. Consumers choosing which product to buy, or voters deciding which option to take with respect to an important issue, typically confront external signals to the information gathered from their contacts. Economic models typically predict that correct social learning occurs in large populations unless some individuals display unbounded influence. We challenge this conclusion by showing that an intuitive threshold process of individual adjustment does not always lead to such social learning. We find, specifically, that three generic regimes exist separated by sharp discontinuous transitions. And only in one of them, where the threshold is within a suitable intermediate range, the population learns the correct information. In the other two, where the threshold is either too high or too low, the system either freezes or enters into persistent flux, respectively. These regimes are generally observed in different social networks (both complex or regular), but limited interaction is found to promote correct learning by enlarging the parameter region where it occurs.
Received: January 10, 2011; Accepted: April 13, 2011; Published: May 27, 2011
Cadmus permanent link: http://hdl.handle.net/1814/21637
Full-text via DOI: 10.1371/journal.pone.0020207
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