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Bandwagoning, free‐riding and heterogeneity in influenza vaccine decisions: An online experiment

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  • Matteo M. Galizzi
  • Krystal W. Lau
  • Marisa Miraldo
  • Katharina Hauck

Abstract

‘Nudge’‐based social norms messages conveying high population influenza vaccination coverage levels can encourage vaccination due to bandwagoning effects but also discourage vaccination due to free‐riding effects on low risk of infection, making their impact on vaccination uptake ambiguous. We develop a theoretical framework to capture heterogeneity around vaccination behaviors, and empirically measure the causal effects of different messages about vaccination coverage rates on four self‐reported and behavioral vaccination intention measures. In an online experiment, N = 1365 UK adults are randomly assigned to one of seven treatment groups with different messages about their social environment's coverage rate (varied between 10% and 95%), or a control group with no message. We find that treated groups have significantly greater vaccination intention than the control. Treatment effects increase with the coverage rate up to a 75% level, consistent with a bandwagoning effect. For coverage rates above 75%, the treatment effects, albeit still positive, stop increasing and remain flat (or even decline). Our results suggest that, at higher coverage rates, free‐riding behavior may partially crowd out bandwagoning effects of coverage rate messages. We also find significant heterogeneity of these effects depending on the individual perceptions of risks of infection and of the coverage rates.

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  • Matteo M. Galizzi & Krystal W. Lau & Marisa Miraldo & Katharina Hauck, 2022. "Bandwagoning, free‐riding and heterogeneity in influenza vaccine decisions: An online experiment," Health Economics, John Wiley & Sons, Ltd., vol. 31(4), pages 614-646, April.
    • Handle: RePEc:wly:hlthec:v:31:y:2022:i:4:p:614-646
    DOI: 10.1002/hec.4467
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    More about this item

    JEL classification:

    • I12 - Health, Education, and Welfare - - Health - - - Health Behavior
    • D91 - Microeconomics - - Micro-Based Behavioral Economics - - - Role and Effects of Psychological, Emotional, Social, and Cognitive Factors on Decision Making
    • Z13 - Other Special Topics - - Cultural Economics - - - Economic Sociology; Economic Anthropology; Language; Social and Economic Stratification

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