goods. Our question is whether supply disruptions are related to (foreign) government-imposed lockdowns or voluntary behavioral changes such as firms and workers choosing to reduce activity beyond the stringency of official containment measures. We assume that these voluntary behaviors are driven by fear of contracting the disease, and we capture them through changes in confirmed cases and deaths. The results in column (7) confirm that the supply disruptions are indeed captured by the lockdown exposure variable, while foreign disease variables do not appear to
course, these are only two countries in our sample, and even in these simple examples there are various possible confounding factors. To claim identification, we develop a rigorous shift-share regression design with appropriate control variables. Figure 1. Lockdown Exposure and Import Growth: Korea and the United States Source: Authors’ calculations using Automatic Identification System data collected by MarineTraffic. Note: Panels 1 and 2 show the distribution of travel times from China to Korea and the US West Coast, respectively. Our lockdown exposure