Chinese Researchers: Strong and Short Stay-At-Home Policy Is Cheaper Than Loose and Long
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Here is a new abstract from SSRN:

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
Jingyuan Wang
Beihang University (BUAA)

Ke Tang
Institute of Economics, School of Social Sciences, Tsinghua University

Kai Feng
Beihang University (BUAA)

Weifeng Lv
Beihang University

Date Written: March 26, 2020

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.

Unfortunately, I can’t find the full paper online. So who really knows?

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