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Navigating the Lobbying Landscape

Insights From Opinion Dynamics Models

Bibliographic Data

ID22106919
AuthorsDaniele Giachini (0000-0002-0001-5240, Scuola Superiore Sant'Anna), Leonardo Ciambezi (0009-0006-1553-4584, Scuola Superiore Sant'Anna), Verdiana Del Rosso (0000-0002-9210-8283, Università di Camerino), Fabrizio Fornari (0000-0002-3620-1723, Università di Camerino), Valentina Pansanella (0000-0001-8106-7677, Istituto di Scienza e Tecnologie dell'Informazione "Alessandro Faedo"), Lilit Popoyan (0000-0002-9209-0896, London School of Business and Management), Alina Sîrbu (0000-0002-3947-7143, University of Bologna)
Year2026
Pages1-22
Publication date2026-01-01
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueIEEE Transactions on Computational Social Systems (JOURNAL)
Journal identifiersISSN: 2329-924X • E-ISSN: 2373-7476
PublisherInstitute of Electrical and Electronics Engineers (IEEE) (PUBLISHER)
DOI10.1109/tcss.2026.3683772
OpenAlexW4416281147
LanguageEN

While lobbying has been demonstrated to have an important effect on public opinion and policy making, existing models of opinion formation do not specifically include its effect. In this work, we introduce a new model of lobbying-driven opinion influence within opinion dynamics, where lobbyists can implement complex strategies and are characterized by a finite budget. Individuals update their opinions through a learning process resembling Bayes-rule updating but using signals generated by the other agents (a form of social learning), modulated by under-reaction and confirmation bias. We study the model theoretically and numerically, demonstrating rich dynamics both with and without lobbyists. In the presence of lobbying, we observe two regimes: one in which lobbyists can have full influence on the agent network, and another where the peer-effect generates polarization. When lobbyists are symmetric, the lobbyist-influence regime is characterized by prolonged opinion oscillations. If lobbyists temporally differentiate their strategies, frontloading is advantageous in the peer-effect regime, whereas backloading is advantageous in the lobbyist-influence regime. These rich dynamics pave the way for studying real lobbying strategies to validate the model in practice

Cheap talk · Opinion leadership · Public opinion · Complex Network Analysis Techniques · Game Theory and Applications · Opinion Dynamics and Social Influence

Citation velocityhistorical
Highly citedNo
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