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The Dynamic and Heterogeneous Effects of COVID-19 Vaccination Mandates in the USA

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  • Nguyen, Manh-Hung
  • Hoang, Viet-Ngu
  • Nghiem, Son
  • Nguyen, Lan Anh

Abstract

Mandatory vaccination for COVID-19 has received intense political and ethical debates, while the literature on the causal effects of vaccination mandates on vaccination outcomes is very limited. In this study, we examine the effects of the announcement of vaccine mandates (VMs) for workers working in three sectors, including health, education, and state governments, on the uptake of first-dose and second-dose vaccination across 50 states in the United States of America. We show that VM announcements have heterogeneous effects; hence, standard two-way fixed effects and difference-in-differences estimators are biased. We present evidence for the heterogeneous treatment effects using recently developed estimators of de Chaisemartin and D’Haultfœuille (2020b) in single and two-treatment settings. In the setting of a single treatment, when treating all VM announcements equally, our results show that VM announcement was associated with an increase of 20.6% first-dose uptake from 1 July to 31 August 2021. In two-treatment settings, our results suggest that VM announcements for workers in health or state government sectors have significant causal effects on first-dose vaccination. Additionally, VM announcements do not have significant causal effects on second-dose uptake. Our results are robust to the choice of differing outcome variables and periods after controlling for state-level covariates, including COVID-19 death, unemployment, and cumulative two-dose vaccination.

Suggested Citation

  • Nguyen, Manh-Hung & Hoang, Viet-Ngu & Nghiem, Son & Nguyen, Lan Anh, 2024. "The Dynamic and Heterogeneous Effects of COVID-19 Vaccination Mandates in the USA," TSE Working Papers 24-1598, Toulouse School of Economics (TSE).
    • Handle: RePEc:tse:wpaper:129950
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    References listed on IDEAS

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    More about this item

    Keywords

    COVID-19; heterogeneous treatment effects; multiple treatment effects; Difference-in-Differences estimator;
    All these keywords.

    JEL classification:

    • I12 - Health, Education, and Welfare - - Health - - - Health Behavior
    • I15 - Health, Education, and Welfare - - Health - - - Health and Economic Development
    • I18 - Health, Education, and Welfare - - Health - - - Government Policy; Regulation; Public Health
    • J18 - Labor and Demographic Economics - - Demographic Economics - - - Public Policy
    • J21 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Labor Force and Employment, Size, and Structure
    • J23 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Labor Demand

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