特朗普政府：扩大对钢铁和铝进口征收50%关税的范围，8月18日生效

Group 1 - The Trump administration has expanded the scope of tariffs on steel and aluminum imports to include hundreds of derivative products, with a 50% tariff rate effective from August 18 [1] - The U.S. Department of Commerce announced that 407 product codes have been added to the tariff list due to their steel and aluminum content [1] - The average trade-weighted tariff rate for the U.S. has risen significantly to 20.11% as of August 7, compared to 2.44% at the beginning of the year [3] Group 2 - The simple average tariff rate for all U.S. goods has increased from 2.08% at the start of the year to 17.39% as of August 7 [4] - The affected global trade volume has surged from $288.46 billion at the beginning of the year to $2.747 trillion currently [4] - The average effective tariff rate has reached 18.6%, the highest level since 1933, according to a report from Yale University's budget laboratory [4] Group 3 - Experts from Japan have criticized the U.S. government's approach to tariff negotiations as a serious infringement on the interests of trade partners and a significant threat to global economic development [6] - The Swiss Federal Council has not considered retaliatory measures against the U.S. tariff increases, citing potential additional costs to the Swiss economy [6] - Mexico and Canada are discussing collaborative strategies to respond to U.S. tariff policies and enhance bilateral cooperation [6]