When is the COVID-19 Pandemic Over? Evidence from the Stay-at-Home Policy Execution in 106 Chinese Cities

17 Pages Posted: 27 Mar 2020 Last revised: 10 Apr 2020

See all articles by Jingyuan Wang

Jingyuan Wang

Beihang University (BUAA)

Ke Tang

Institute of Economics, School of Social Sciences, Tsinghua University

Kai Feng

Institute of Economics, School of Social Sciences, Tsinghua University

Weifeng Lv

Beihang University

Date Written: March 26, 2020

Abstract

As more and more countries have employed stay-at-home policy to halt the spread of COVID-19, the effectiveness of this policy has become an important question to both researchers and policymakers. To answer this question, our paper empirically measures the effect of stay-at-home policy on the control of COVID-19. Using the city-level Baidu Mobility Index, measured by the total number of outside travels per day divided by the resident population, we find that reducing the number of outings can effectively decrease the new-onset cases; a 1% decline in the outing number will reduce about 1% of the new-onset-cases growth rate in 7 days (one serial interval). The critical level is a 50% drop in mobility, in which case the number of new-onset cases is lower than it was 7 days before, and hence the epidemic will gradually disappear holding this policy long enough. A strong stay-at-home policy execution with a short duration has a smaller economic cost than a loose execution with a long duration. For example, the mobility in Wuhan is down 85% after lockdown, in which case we estimate the number of new-onset cases is reduced by 50% in only 12 days.

Keywords: COVID-19, Stay at home, Baidu Mobility Index, Movement restriction

JEL Classification: H1, I1

Suggested Citation

Wang, Jingyuan and Tang, Ke and Feng, Kai and Lv, Weifeng, When is the COVID-19 Pandemic Over? Evidence from the Stay-at-Home Policy Execution in 106 Chinese Cities (March 26, 2020). Available at SSRN: https://ssrn.com/abstract=3561491 or http://dx.doi.org/10.2139/ssrn.3561491

Jingyuan Wang

Beihang University (BUAA) ( email )

37 Xue Yuan Road
Beijing 100083
China

Ke Tang (Contact Author)

Institute of Economics, School of Social Sciences, Tsinghua University ( email )

No.1 Tsinghua Garden
Beijing, 100084
China

Kai Feng

Institute of Economics, School of Social Sciences, Tsinghua University ( email )

Beijing 100084
China

Weifeng Lv

Beihang University

37 Xue Yuan Road
Beijing 100083
China

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