Group 1 - The U.S. government has expanded the scope of tariffs on steel and aluminum imports to include 407 additional product codes, effective August 18, indicating a continued trend of trade protectionism [1][3] - The unilateral tariff policy is expected to disrupt global supply chains, increasing costs for related companies and potentially forcing multinational corporations to reconsider their procurement strategies and production locations [3][6] - The tariff increase may lead to retaliatory measures from affected countries, escalating trade tensions and impacting global market prices and supply chain stability [3][4] Group 2 - The policy highlights issues in U.S. global economic governance, as it relies on unilateral tariffs to gain political leverage while undermining international trade rules and multilateral cooperation [4][9] - Capital markets are reacting sensitively to the policy, with increased volatility in stock prices of affected industries, as investors seek safer investments amid policy uncertainty [6][9] - The long-term implications of the tariff increase may weaken U.S. competitiveness in international markets, as companies will need to factor in policy risks alongside efficiency and cost considerations [7][9]