Dresden 2020 – scientific programme
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SOE: Fachverband Physik sozio-ökonomischer Systeme
SOE 13: Focus Session: Opinion Formation
SOE 13.7: Talk
Thursday, March 19, 2020, 11:00–11:15, GÖR 226
Surprising Effects of Inhomogeneity on Opinion Dynamics — •Hendrik Schawe and Laura Hernández — Laboratoire de Physique Théorique et Modèlisation, Université de Cergy-Pontoise, France
We study the Hegselmann-Krause model for bounded confidence opinion dynamics. The premise is that an agent i will assume in each timestep the average opinion of the agents whose opinions differ by at most εi from its own opinion xi. In the original model, the confidence εi is equal for all agents, but since a society is usually comprised of diverse individua, we study the case of inhomogeneous εi. This case is, up to now, mainly studied for few subpopulations each having a narrow range from which the confidences εi are drawn [1, 2]. Instead, we draw the confidences for each agent from parametrized uniform distributions U(εl, εu). Our systematic study of the whole parameter space shows non-monotonous and counterintuitive behavior, e.g., increasing the trustfulness of the most open minded agents (i.e., increasing εu) may lead to a loss of consensus.
[1] Lorenz, J., Complexity, 15: 43-52 (2010), doi:10.1002/cplx.20295
[2] Liang, H., Yang, Y., Wang X., Physica A, 392(9): 2248-2256 (2013), doi: 10.1016/j.physa.2013.01.008