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Homophily and infections: static and dynamic effects

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  • Matteo Bizzarri
  • Fabrizio Panebianco
  • Paolo Pin

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," Papers 2304.11934, arXiv.org.
    • Handle: RePEc:arx:papers:2304.11934
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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

    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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