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Asymmetric Contrarians in Opinion Dynamics

Abstract : Asymmetry in contrarian behavior is investigated within the Galam model of opinion dynamics using update groups of size 3 with two competing opinions A and B. Denoting x and y the respective proportions of A and B contrarians, four schemes of implementations are studied. The first scheme activates contrarians after each series of updates with probabilities x and y for agents holding respectively opinion A and B. Second scheme activates contrarians within the update groups only against global majority with probability x when A is the majority and y when B is the majority. The third scheme considers in-group contrarians acting prior to the local majority update against both local majority and minority opinions. The last scheme activates in-group contrarians prior to the local majority update but only against the local majority. The main result is the loss of the fifty–fifty attractor produced by symmetric contrarians. Producing a bit less contrarians on its own side than the other side becomes the key to win a public debate, which in turn can guarantee an election victory. The associated phase diagram of opinion dynamics is found to exhibit a rich variety of counterintuitive results.
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Submitted on : Thursday, December 10, 2020 - 2:38:45 PM
Last modification on : Friday, July 2, 2021 - 1:59:53 PM

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Serge Galam, Taksu Cheon. Asymmetric Contrarians in Opinion Dynamics. Entropy, MDPI, 2020, 22 (1), pp.1 - 19. ⟨10.3390/e22010025⟩. ⟨hal-03052089⟩

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