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Vaccination under pessimistic expectations in clinical trials and immunization campaigns

Author

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  • Hippolyte d'Albis
  • Johanna Etner
  • Josselin Thuilliez

Abstract

We provide one of the first formalizations of a vaccination campaign in a decision‐theoretic framework. We analyze a model where an ambiguity‐averse individual must decide how much effort to invest into prevention in the context of a rampant disease. We study how ambiguity aversion affects the effort and the estimation of the vaccine efficacy in clinical trials and immunization campaigns. We find that the behaviors of individuals participating in a clinical trial differ from individuals not participating. Individuals who are more optimistic toward vaccination participate more in trials. Their behaviors and efforts are also affected. As a result, because vaccine efficacy depends on unobserved behaviors and efforts, the biological effect of the vaccine becomes difficult to evaluate. During the scale‐up phase of a vaccination campaign, provided that vaccine efficacy is established, we show that vaccine hesitancy may still be rational.

Suggested Citation

  • Hippolyte d'Albis & Johanna Etner & Josselin Thuilliez, 2023. "Vaccination under pessimistic expectations in clinical trials and immunization campaigns," Journal of Public Economic Theory, Association for Public Economic Theory, vol. 25(6), pages 1188-1211, December.
    • Handle: RePEc:bla:jpbect:v:25:y:2023:i:6:p:1188-1211
    DOI: 10.1111/jpet.12617
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    References listed on IDEAS

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    1. Jewitt, Ian & Mukerji, Sujoy, 2017. "Ordering ambiguous acts," Journal of Economic Theory, Elsevier, vol. 171(C), pages 213-267.
    2. David Crainich & Louis Eeckhoudt & Mario Menegatti, 2019. "Vaccination as a trade-off between risks," Italian Economic Journal: A Continuation of Rivista Italiana degli Economisti and Giornale degli Economisti, Springer;Società Italiana degli Economisti (Italian Economic Association), vol. 5(3), pages 455-472, October.
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    Cited by:

    1. Thuilliez, Josselin & Touré, Nouhoum, 2024. "Opinions and vaccination during an epidemic," Journal of Mathematical Economics, Elsevier, vol. 111(C).
    2. Josselin Thuilliez & Nouhoum Touré, 2024. "Opinions and vaccination during an epidemic," Post-Print hal-04490900, HAL.
    3. 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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