Glass, CatherinGlass, David H.2021-12-222021-12-222021-09-19Glass, C.A. and Glass, D.H. (2020) ‘Social Influence of Competing Groups and Leaders in Opinion Dynamics’, Computational Economics. Springer Science and Business Media LLC. doi:10.1007/s10614-020-10049-7.0927-70991572-9974https://doi.org/10.1007/s10614-020-10049-7Publication history: Accepted - 11 September 2020; Published online - 19 September 2020.This paper explores the infuence of two competing stubborn agent groups on the opinion dynamics of normal agents. Computer simulations are used to investigate the parameter space systematically in order to determine the impact of group size and extremeness on the dynamics and identify optimal strategies for maximizing numbers of followers and social infuence. Results show that (a) there are many cases where a group that is neither too large nor too small and neither too extreme nor too central achieves the best outcome, (b) stubborn groups can have a moderating, rather than polarizing, efect on the society in a range of circumstances, and (c) small changes in parameters can lead to transitions from a state where one stubborn group attracts all the normal agents to a state where the other group does so. We also explore how these fndings can be interpreted in terms of opinion leaders, truth, and campaignsenThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licen ses/by/4.0/Stubborn agentsCompeting groupsHegelsmann-Krause modelOpinion dynamicsOpinion leaderArticle