identification strategy. Because China was among the first countries to impose lockdown restrictions, a visual analysis of its initial effects is less likely to be affected by confounding factors, and therefore more amenable to a simple illustration. The top two panels in Figure 1 show the distribution of travel times before the pandemic in our bilateral seaborne trade data set from China to Korea ( Figure 1 , panel 1) and from China to the US West Coast ( Figure 1 , panel 2). With most trips taking between one and three days, the lockdowns imposed by China on January 23