据新华社报道，在美国最高法院驳回白宫利用《国际紧急经济权力法》（IEEPA）实施关税的企图后， 特朗普政府迅速启动"B计划"，援引《1974年贸易法》第122条款对全球进口商品实施最高15%的关税。 然而，这一旨在应对"国际收支危机"的紧急工具正面临来自经济学家和法律界对其合法性的广泛质疑， 核心争议在于美国当前的经济基本面并不符合该条款法定的适用门槛。 尽管如此，实际操作层面的时间差可能有利于特朗普政府。分析指出，法院很难在法规允许的150天期 限内对第122条款关税的合法性做出最终裁决。这为特朗普政府争取了更多时间，使其能够利用第232条 和第301条等更成熟的法律授权，在国家安全和不公平贸易行为等理由下，寻求制定更具体的关税措 施。 赤字数据背后的经济逻辑悖论 据华尔街见闻文章，为了证明关税的必要性，特朗普在总统公告中特别提及了美国高达负26万亿美元 的"净国际投资头寸"（NIIP），即美国对外资产与外国对美资产的差额，以此佐证国际收支关系正在恶 化。 然而，经济学家对这一归因并不买账。相关分析指出，NIIP为负的一个重要原因是外国持有的美国资产 价值显著高于美国持有的海外资产，而美国股市的上涨——这一 ...

Core Viewpoint - The U.S. Supreme Court's ruling does not dismantle the tariff barriers established by former President Trump, as he may still utilize various legal tools to reinstate large-scale tariffs [1][8]. Group 1: Legal Tools for Tariffs - The 1962 Trade Expansion Act's Section 232 is the most relied upon tool for tariffs, allowing the President to impose tariffs on imports for national security reasons without limits on rates or duration [2][9]. - Section 301 of the 1974 Trade Act empowers the U.S. Trade Representative to impose tariffs on countries deemed discriminatory against U.S. businesses, with no upper limit on rates [3][10]. - Section 122 of the 1974 Trade Act permits the President to impose tariffs of up to 15% for a maximum of 150 days in response to significant international payment imbalances, without prior investigation [12][13]. Group 2: Limitations and Challenges - Section 232 requires a Department of Commerce investigation, which can take up to 270 days, limiting its immediate implementation [2][9]. - Section 301 involves a complex process of investigation and public consultation, making it cumbersome for targeting multiple smaller countries [4][11]. - Section 201 of the 1974 Trade Act allows tariffs if increased imports threaten U.S. manufacturers, but it also requires an investigation and has a maximum tariff rate of 50% [6][14]. Group 3: Controversial Options - The 1930 Smoot-Hawley Tariff Act's Section 338 allows the President to impose tariffs of up to 50% without prior investigation, but it has not been used historically due to concerns about its impact on global trade [5][15]. - There are political concerns regarding the potential use of Section 338, as evidenced by a resolution from five Democratic Congress members seeking its repeal [7][16].