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Homophily and Infections: Static and Dynamic Effects

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Abstract

We analyze the effect of homophily in an epidemics between two groups of agents that differ in vaccination rates (“vaxxers" and “anti-vaxxers"). The steady state infection rate is hump-shaped in homophily, whereas the cumulative number of agents infected during an outbreak is u-shaped. If vaccination rates are endogenous, homophily has the opposite impact on the two groups, but the qualitative behavior of the aggregate is unchanged. However, the sign of the group-level impact is the opposite if vaccination is motivated by infection risk or by peer pressure. If motivations are group-specific, homophily can be harmful for both groups.

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  • Matteo Bizzarri & Fabrizio Panebianco & Paolo Pin, 2023. "Homophily and Infections: Static and Dynamic Effects," CSEF Working Papers 672, Centre for Studies in Economics and Finance (CSEF), University of Naples, Italy.
  • Handle: RePEc:sef:csefwp:672
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    1. Xavier Gabaix & Jean‐Michel Lasry & Pierre‐Louis Lions & Benjamin Moll, 2016. "The Dynamics of Inequality," Econometrica, Econometric Society, vol. 84, pages 2071-2111, November.
    2. Rowthorn, Robert & Toxvaerd, Flavio, 2012. "The Optimal Control of Infectious Diseases via Prevention and Treatment," CEPR Discussion Papers 8925, C.E.P.R. Discussion Papers.
    3. Mitman, Kurt & Hanley, Douglas & Bognanni, Mark & Kolliner, Daniel, 2020. "Economics and Epidemics: Evidence from an Estimated Spatial Econ-SIR Model," CEPR Discussion Papers 15310, C.E.P.R. Discussion Papers.
    4. Daron Acemoglu & Victor Chernozhukov & Iván Werning & Michael D. Whinston, 2021. "Optimal Targeted Lockdowns in a Multigroup SIR Model," American Economic Review: Insights, American Economic Association, vol. 3(4), pages 487-502, December.
    5. Sergio Currarini & Matthew O. Jackson & Paolo Pin, 2009. "An Economic Model of Friendship: Homophily, Minorities, and Segregation," Econometrica, Econometric Society, vol. 77(4), pages 1003-1045, July.
    6. Andrea Galeotti & Brian W. Rogers, 2013. "Strategic Immunization and Group Structure," American Economic Journal: Microeconomics, American Economic Association, vol. 5(2), pages 1-32, May.
    7. Jackson, Matthew O. & Lã“Pez-Pintado, Dunia, 2013. "Diffusion and contagion in networks with heterogeneous agents and homophily," Network Science, Cambridge University Press, vol. 1(1), pages 49-67, April.
    8. Toxvaerd, Flavio & Rowthorn, Robert, 2022. "On the management of population immunity," Journal of Economic Theory, Elsevier, vol. 204(C).
    9. Bisin, Alberto & Gottardi, Piero, 2021. "Efficient policy interventions in an epidemic," Journal of Public Economics, Elsevier, vol. 200(C).
    10. Luiz Brotherhood & Philipp Kircher & Cezar Santos & Michéle Tertilt, 2020. "An Economic Model of the COVID-19 Pandemic With Young and Old Agents: Behavior, Testing and Policies," CRC TR 224 Discussion Paper Series crctr224_2020_175v2, University of Bonn and University of Mannheim, Germany.
    11. Benjamin Golub & Matthew O. Jackson, 2012. "How Homophily Affects the Speed of Learning and Best-Response Dynamics," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 127(3), pages 1287-1338.
    12. Goyal, Sanjeev & Vigier, Adrien, 2015. "Interaction, protection and epidemics," Journal of Public Economics, Elsevier, vol. 125(C), pages 64-69.
    13. Farboodi, Maryam & Jarosch, Gregor & Shimer, Robert, 2021. "Internal and external effects of social distancing in a pandemic," Journal of Economic Theory, Elsevier, vol. 196(C).
    14. Talamàs, Eduard & Vohra, Rakesh, 2020. "Free and perfectly safe but only partially effective vaccines can harm everyone," Games and Economic Behavior, Elsevier, vol. 122(C), pages 277-289.
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    Cited by:

    1. Josselin Thuilliez & Nouhoum Touré, 2024. "Opinions and vaccination during an epidemic," Post-Print hal-04490900, HAL.
    2. Josselin Thuilliez & Nouhoum Touré, 2024. "Opinions and vaccination during an epidemic," Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) hal-04490900, HAL.

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    More about this item

    Keywords

    Homophily; seasonal diseases; vaccination; anti-vaccination movements; SIS-type model.;
    All these keywords.

    JEL classification:

    • D62 - Microeconomics - - Welfare Economics - - - Externalities
    • D85 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Network Formation
    • I12 - Health, Education, and Welfare - - Health - - - Health Behavior
    • I18 - Health, Education, and Welfare - - Health - - - Government Policy; Regulation; Public Health

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