As the United States ends import duty exemptions for parcels valued under US$800 shipped from anywhere in the world, many Chinese merchants have already established US warehouses to cushion the blow.Li Chen, professor of manufacturing management at Cornell University’s SC Johnson College of Business, said China’s exposure was likely to be limited, citing the resilience of its cross-border platforms such as Shein and Temu.America’s “de minimis” exemption will end on Friday, after US President...