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How Social Networks Shape Our Beliefs: A Natural Experiment among Future French Politicians

Author

Listed:
  • Yann Algan

    (Département d'économie)

  • Quoc-Anh Do

    (Département d'économie)

  • Nicolò Dalvit
  • Alexis Le Chapelain

    (Département d'économie)

  • Yves Zenou

    (Research Institute of Industrial Economics)

Abstract

This paper shows how a public policy shapes convergence of beliefs through newly-formed social networks, with a focus on political opinion. We use a unique natural experiment that randomly assigns students into first-year groups at a French college that forms future top politicians. Pairs of students in the same group are much more likely to become friends. The randomized group membership serves as instrumental variable in a dyadic regression of differences in beliefs on friendship. We find that students’ political opinions converge particularly strongly between friends, reaching 11% of a standard deviation only after 6 months. Convergence is strongest among pairs least likely to become friends without the randomized exposure, or friends whose characteristics are the most different. While there is evidence of homophily in network formation, it does not seem to affect the estimates of convergence, except among very similar friends. The same strategy shows that a longer network distance implies slower convergence.

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  • Yann Algan & Quoc-Anh Do & Nicolò Dalvit & Alexis Le Chapelain & Yves Zenou, 2015. "How Social Networks Shape Our Beliefs: A Natural Experiment among Future French Politicians," Sciences Po publications info:hdl:2441/78vacv4udu9, Sciences Po.
  • Handle: RePEc:spo:wpmain:info:hdl:2441/78vacv4udu92eq3fec89svm9uv
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    1. Maité Laméris & Pierre-Guillaume Méon & Anne-Marie Van Prooijen, 2019. "What have we done? The impact of choosing and studying different academic disciplines on beliefs and values," Working Papers CEB 19-007, ULB -- Universite Libre de Bruxelles.
    2. Gilat Levy & Ronny Razin, 2017. "The Coevolution of Segregation, Polarized Beliefs, and Discrimination: The Case of Private versus State Education," American Economic Journal: Microeconomics, American Economic Association, vol. 9(4), pages 141-170, November.
    3. Matthew O. Jackson & Brian W. Rogers & Yves Zenou, 2017. "The Economic Consequences of Social-Network Structure," Journal of Economic Literature, American Economic Association, vol. 55(1), pages 49-95, March.
    4. Francesco Drago & Friederike Mengel & Christian Traxler, 2020. "Compliance Behavior in Networks: Evidence from a Field Experiment," American Economic Journal: Applied Economics, American Economic Association, vol. 12(2), pages 96-133, April.
    5. Quoc-Anh Do & Yen-Teik Lee & Bang Dang Nguyen, 2016. "Directors as Connectors: The Impact of the External Networks of Directors on Firms," Sciences Po publications 52, Sciences Po.
    6. Lisa Windsteiger, 2018. "Monopolistic Supply of Sorting, Inequality and Welfare," Working Papers tax-mpg-rps-2018-15, Max Planck Institute for Tax Law and Public Finance.
    7. Jackson, Matthew O. & Rogers, Brian & Zenou, Yves, 2016. "Networks: An economic perspective," CEPR Discussion Papers 11452, C.E.P.R. Discussion Papers.
    8. Lisa Windsteiger, 2018. "Sorting in the Presence of Misperceptions," Working Papers tax-mpg-rps-2018-08, Max Planck Institute for Tax Law and Public Finance.

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    More about this item

    Keywords

    Political Beliefs; Peers; Social Networks; Convergence; Homophily; Belief Transmission; Learning; Diffusion; Natural Experiment;
    All these keywords.

    JEL classification:

    • C93 - Mathematical and Quantitative Methods - - Design of Experiments - - - Field Experiments
    • D72 - Microeconomics - - Analysis of Collective Decision-Making - - - Political Processes: Rent-seeking, Lobbying, Elections, Legislatures, and Voting Behavior
    • Z13 - Other Special Topics - - Cultural Economics - - - Economic Sociology; Economic Anthropology; Language; Social and Economic Stratification

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