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Trust and Manipulation in Social Networks

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  • Manuel Förster

    ()
    (CES - Centre d'économie de la Sorbonne - CNRS : UMR8174 - Université Paris 1 - Panthéon-Sorbonne, CORE - Center of Operation Research and Econometrics [Louvain] - Université Catholique de Louvain (UCL) - Belgique)

  • Ana Mauleon

    ()
    (CORE - Center of Operation Research and Econometrics [Louvain] - Université Catholique de Louvain (UCL) - Belgique, CEREC - Université Saint-Louis - Bruxelles)

  • Vincent Vannetelbosch

    ()
    (CORE - Center of Operation Research and Econometrics [Louvain] - Université Catholique de Louvain (UCL) - Belgique, CEREC - Université Saint-Louis - Bruxelles)

Abstract

We investigate the role of manipulation in a model of opinion formation where agents have opinions about some common question of interest. Agents repeatedly communicate with their neighbors in the social network, can exert some effort to manipulate the trust of others, and update their opinions taking weighted averages of neighbors' opinions. The incentives to manipulate are given by the agents' preferences. We show that manipulation can modify the trust structure and lead to a connected society, and thus, make the society reaching a consensus. Manipulation fosters opinion leadership, but the manipulated agent may even gain influence on the long-run opinions. In sufficiently homophilic societies, manipulation accelerates (slows down) convergence if it decreases (increases) homophily. Finally, we investigate the tension between information aggregation and spread of misinformation. We find that if the ability of the manipulating agent is weak and the agents underselling (overselling) their information gain (lose) overall influence, then manipulation reduces misinformation and agents converge jointly to more accurate opinions about some underlying true state.

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Bibliographic Info

Paper provided by HAL in its series Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) with number halshs-00881145.

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Date of creation: Sep 2013
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Handle: RePEc:hal:cesptp:halshs-00881145

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Related research

Keywords: Social networks; trust; manipulation; opinion leadership; consensus; wisdom of crowds;

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References

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  1. Büchel, Berno & Hellmann, Tim & Klößner, Stefan, 2013. "Opinion Dynamics under Conformity," Annual Conference 2013 (Duesseldorf): Competition Policy and Regulation in a Global Economic Order 79770, Verein für Socialpolitik / German Economic Association.
  2. CAULIER, Jean-François & MAULEON, Ana & VANNETELBOSCH, Vincent, 2013. "Allocation rules for coalitional network games," CORE Discussion Papers 2013032, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  3. Daron Acemoglu & Munther A. Dahleh & Ilan Lobel & Asuman Ozdaglar, 2011. "Bayesian Learning in Social Networks," Review of Economic Studies, Oxford University Press, vol. 78(4), pages 1201-1236.
  4. Acemoglu, Daron & Ozdaglar, Asuman & ParandehGheibi, Ali, 2010. "Spread of (mis)information in social networks," Games and Economic Behavior, Elsevier, vol. 70(2), pages 194-227, November.
  5. Daron Acemoglu & Asuman E. Ozdaglar, 2010. "Opinion Dynamics and Learning in Social Networks," Levine's Working Paper Archive 661465000000000222, David K. Levine.
  6. Gullberg, Anne Therese, 2008. "Lobbying friends and foes in climate policy: The case of business and environmental interest groups in the European Union," Energy Policy, Elsevier, vol. 36(8), pages 2954-2962, August.
  7. Shachar Kariv & Syngjoo Choi & Douglas Gale, 2007. "Social Learning in Networks: A Quantal Response Equilibrium Analysis of Experimental Data," Levine's Bibliography 843644000000000107, UCLA Department of Economics.
  8. Manuel Förster & Ana Mauleon & Vincent Vannetelbosch, 2013. "Trust and Manipulation in Social Networks," Documents de travail du Centre d'Economie de la Sorbonne 13065, Université Panthéon-Sorbonne (Paris 1), Centre d'Economie de la Sorbonne.
  9. Nigar Hashimzade & Jean Hindriks & Gareth D. Myles, 2006. "Solutions Manual to Accompany Intermediate Public Economics," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262582694, January.
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Cited by:
  1. WOLSEY, Laurence & YAMAN , Hand & ,, 2013. "Continuous knapsack sets with divisible capacities," CORE Discussion Papers 2013063, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  2. BELLELFLAMME, Paul & BLOCH , Francis & ,, 2013. "Dynamic protection of innovations through patents and trade secrets," CORE Discussion Papers 2013059, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  3. MADANI, Mehdi & VAN VYVE, Mathieu, 2013. "A new formulation of the European day-ahead electricity market problem and its algorithmic consequences," CORE Discussion Papers 2013074, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  4. RUSSO, Federica & MOUCHART, Michel & WUNSCH, Guillaume, 2013. "Confounding and control in a multivariate system. An issue in causal attribution," CORE Discussion Papers 2013068, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  5. Manuel Förster & Ana Mauleon & Vincent Vannetelbosch, 2013. "Trust and Manipulation in Social Networks," Documents de travail du Centre d'Economie de la Sorbonne 13065, Université Panthéon-Sorbonne (Paris 1), Centre d'Economie de la Sorbonne.
  6. MANIQUET, François & MORELLI, Massimo & ,, 2013. "Approval quorums dominate participation quorums," CORE Discussion Papers 2013054, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  7. PARDO-GARCIA, Christina & SEMPERE-MONERRIS, Jose J., 2013. "Equilibrium mergers in a composite good industry with efficiencies," CORE Discussion Papers 2013067, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  8. LAMAS, ALEJANDRO & CHEVALIER, Philippe, 2013. "Jumping the hurdles for collaboration: fairness in operations pooling in the absence of transfer payments," CORE Discussion Papers 2013073, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  9. VARDAR, N. Baris, 2013. "Imperfect resource substitution and optimal transition to clean technologies," CORE Discussion Papers 2013072, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  10. DI SUMMA, Marco, 2013. "The convex hull of the all-different system with the inclusion property: a simple proof," CORE Discussion Papers 2013069, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  11. MAULEON, Ana & MOLIS, Elena & VANNETELBOSCH, Vincent & VERGOTE , Wouter, 2013. "Dominance invariant one-to-one matching problems," CORE Discussion Papers 2013052, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  12. GABSZEWICZ, Jean & ZANAJ, Skerdilajda & ,, 2013. "(Un)stable vertical collusive agreements," CORE Discussion Papers 2013053, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  13. PAPAVASILIOU, Anthony & HE, Yi & SVOBODA, Alva, 2013. "Self-commitment of combined cycle units under electricity price uncertainty," CORE Discussion Papers 2013051, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).

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