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A citywide experiment testing the impact of geographically targeted, high-pay-off vaccine lotteries

Author

Listed:
  • Katherine L. Milkman

    (University of Pennsylvania)

  • Linnea Gandhi

    (University of Pennsylvania)

  • Sean F. Ellis

    (University of Pennsylvania)

  • Heather N. Graci

    (University of Pennsylvania)

  • Dena M. Gromet

    (University of Pennsylvania)

  • Rayyan S. Mobarak

    (University of Pennsylvania)

  • Alison M. Buttenheim

    (University of Pennsylvania
    University of Pennsylvania)

  • Angela L. Duckworth

    (University of Pennsylvania
    University of Pennsylvania)

  • Devin Pope

    (University of Chicago)

  • Ala Stanford

    (US Department of Health and Human Services)

  • Richard Thaler

    (University of Chicago)

  • Kevin G. Volpp

    (University of Pennsylvania
    University of Pennsylvania)

Abstract

Lotteries have been shown to motivate behaviour change in many settings, but their value as a policy tool is relatively untested. We implemented a pre-registered, citywide experiment to test the effects of three high-pay-off, geographically targeted lotteries designed to motivate adult Philadelphians to get their COVID-19 vaccine. In each drawing, the residents of a randomly selected ‘treatment’ zip code received half the lottery prizes, boosting their chances of winning to 50×–100× those of other Philadelphians. The first treated zip code, which drew considerable media attention, may have experienced a small bump in vaccinations compared with the control zip codes: average weekly vaccinations rose by an estimated 61 per 100,000 people per week (+11%). After pooling the results from all three zip codes treated during our six-week experiment, however, we do not detect evidence of any overall benefits. Furthermore, our 95% confidence interval provides a 9% upper bound on the net benefits of treatment in our study.

Suggested Citation

  • Katherine L. Milkman & Linnea Gandhi & Sean F. Ellis & Heather N. Graci & Dena M. Gromet & Rayyan S. Mobarak & Alison M. Buttenheim & Angela L. Duckworth & Devin Pope & Ala Stanford & Richard Thaler &, 2022. "A citywide experiment testing the impact of geographically targeted, high-pay-off vaccine lotteries," Nature Human Behaviour, Nature, vol. 6(11), pages 1515-1524, November.
    • Handle: RePEc:nat:nathum:v:6:y:2022:i:11:d:10.1038_s41562-022-01437-0
    DOI: 10.1038/s41562-022-01437-0
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    References listed on IDEAS

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    Cited by:

    1. Upravitelev, A., 2023. "Efficacious methods of restraining COVID-19 through behavioral public policy," Journal of the New Economic Association, New Economic Association, vol. 61(4), pages 203-222.

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