La complexité d’un modèle simplifié d’interactions sociales : le modèle Léviathan

Guillaume Deffuant, Sylvie Huet, Timoteo Carletti

Research output: Contribution in Book/Catalog/Report/Conference proceedingChapter (peer-reviewed)


We propose an opinion dynamics model that combines processes
of vanity and opinion propagation. The interactions take place between
randomly chosen pairs. During an interaction, the agents propagate their
opinions about themselves and about other people they know. Moreover,
each individual is subject to vanity: if her interlocutor seems to value her
highly, then she increases her opinion about this interlocutor. On the contrary
she tends to decrease her opinion about those who seem to undervalue
her. The combination of these dynamics with the hypothesis that the opinion
propagation is more efficient when coming from highly valued individuals,
leads to different patterns when varying the parameters. For instance, for
some parameters the positive opinion links between individuals generate
a small world network. In one of the patterns, absolute dominance of one
agent alternates with a state of generalised distrust, where all agents have
a very low opinion of all the others (including themselves). We provide some
explanations of the mechanisms behind these emergent behaviors and finally
propose a discussion about their interest.
Original languageFrench
Title of host publicationModéliser & simuler. Epistémologies et pratiques de la modélisation et de la simulation
PublisherÉditions Matériologiques
ISBN (Electronic) 978-2-919694-19-8
Publication statusPublished - 19 Apr 2013

Publication series

NameSciences & Philosopie
PublisherÉditions Matériologiques


  • reputation dynamics
  • social dynamics
  • opinion dynamics
  • vanity
  • Leviathan

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