世界银行：应对COVID-19大流行危机的贸易政策（英文版）

This paper presents new high-frequency data on trade policy changes targeting medical and food products since the beginning of the COVID-19 pandemic, documenting how countries used trade policy instruments in response to the health crisis on a week-by-week basis. The data set reveals a rapid increase in trade policy activism in February and March 2020 in tandem with the rise in COVID-19 cases, but also uncovers extensive heterogeneity across countries in their use of trade policy and