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Face Masks Considerably Reduce COVID-19 Cases in Germany: A Synthetic Control Method Approach

Author

Listed:
  • Mitze, Timo

    (University of Southern Denmark)

  • Kosfeld, Reinhold

    (University of Kassel)

  • Rode, Johannes

    (Darmstadt University of Technology)

  • Wälde, Klaus

    (University of Mainz)

Abstract

We use the synthetic control method to analyze the effect of face masks on the spread of Covid-19 in Germany. Our identification approach exploits regional variation in the point in time when face masks became compulsory. Depending on the region we analyse, we find that face masks reduced the cumulative number of registered Covid-19 cases between 2.3% and 13% over a period of 10 days after they became compulsory. Assessing the credibility of the various estimates, we conclude that face masks reduce the daily growth rate of reported infections by around 40%.

Suggested Citation

  • Mitze, Timo & Kosfeld, Reinhold & Rode, Johannes & Wälde, Klaus, 2020. "Face Masks Considerably Reduce COVID-19 Cases in Germany: A Synthetic Control Method Approach," IZA Discussion Papers 13319, Institute of Labor Economics (IZA).
    • Handle: RePEc:iza:izadps:dp13319
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    References listed on IDEAS

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    1. Mitze, Timo & Kosfeld, Reinhold & Rode, Johannes & Wälde, Klaus, 2020. "Face Masks Considerably Reduce COVID-19 Cases in Germany: A Synthetic Control Method Approach," IZA Discussion Papers 13319, Institute of Labor Economics (IZA).
    2. Timo Mitze & Reinhold Kosfeld & Johannes Rode & Klaus Wälde, 2020. "Face Masks Considerably Reduce Covid-19 Cases in Germany," Working Papers 2016, Gutenberg School of Management and Economics, Johannes Gutenberg-Universität Mainz.
    3. Abadie, Alberto & Diamond, Alexis & Hainmueller, Jens, 2010. "Synthetic Control Methods for Comparative Case Studies: Estimating the Effect of California’s Tobacco Control Program," Journal of the American Statistical Association, American Statistical Association, vol. 105(490), pages 493-505.
    4. Donsimoni Jean Roch & Glawion René & Plachter Bodo & Wälde Klaus, 2020. "Projecting the spread of COVID-19 for Germany," German Economic Review, De Gruyter, vol. 21(2), pages 181-216, June.
    5. Sebastian Galiani & Brian Quistorff, 2017. "The synth runner package: Utilities to automate synthetic control estimation using synth," Stata Journal, StataCorp LP, vol. 17(4), pages 834-849, December.
    6. Noémi Kreif & Richard Grieve & Dominik Hangartner & Alex James Turner & Silviya Nikolova & Matt Sutton, 2016. "Examination of the Synthetic Control Method for Evaluating Health Policies with Multiple Treated Units," Health Economics, John Wiley & Sons, Ltd., vol. 25(12), pages 1514-1528, December.
    7. Mitze, Timo & Kosfeld, Reinhold & Rode, Johannes & Wälde, Klaus, 2020. "Face masks considerably reduce COVID-19 cases in Germany," Publications of Darmstadt Technical University, Institute for Business Studies (BWL) 124130, Darmstadt Technical University, Department of Business Administration, Economics and Law, Institute for Business Studies (BWL).
    8. Alberto Abadie & Javier Gardeazabal, 2003. "The Economic Costs of Conflict: A Case Study of the Basque Country," American Economic Review, American Economic Association, vol. 93(1), pages 113-132, March.
    9. Jean Roch Donsimoni & René Glawion & Bodo Plachter & Constantin Weiser & Klaus Wälde, 2020. "Should contact bans be lifted in Germany?," Working Papers 2008, Gutenberg School of Management and Economics, Johannes Gutenberg-Universität Mainz.
    10. Donsimoni, Jean Roch & Glawion, René & Plachter, Bodo & Weiser, Constantin & Wälde, Klaus, 2020. "Should Contact Bans Be Lifted in Germany? A Quantitative Prediction of Its Effects," IZA Discussion Papers 13151, Institute of Labor Economics (IZA).
    11. Hu, Luojia & Kaestner, Robert & Mazumder, Bhashkar & Miller, Sarah & Wong, Ashley, 2018. "The effect of the affordable care act Medicaid expansions on financial wellbeing," Journal of Public Economics, Elsevier, vol. 163(C), pages 99-112.
    12. Andrew I. Friedson & Drew McNichols & Joseph J. Sabia & Dhaval Dave, 2020. "Did California’s Shelter-in-Place Order Work? Early Coronavirus-Related Public Health Effects," NBER Working Papers 26992, National Bureau of Economic Research, Inc.
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    More about this item

    Keywords

    synthetic control method; face masks; public health measures; COVID-19; Germany;
    All these keywords.

    JEL classification:

    • I18 - Health, Education, and Welfare - - Health - - - Government Policy; Regulation; Public Health
    • C23 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Models with Panel Data; Spatio-temporal Models

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