美国，突传利空！

Group 1 - The core viewpoint of the article is that the U.S. credit rating has been downgraded by Scope Ratings due to ongoing fiscal deterioration and weakened governance standards [2][3] - Scope Ratings has lowered the U.S. credit rating to AA-, which is three levels below its highest rating, indicating significant concerns about the country's fiscal health [2] - The agency warns that the ongoing government shutdown has increased the risk of policy missteps and reduced the predictability of U.S. policy-making [2][3] Group 2 - As of October 21, the total U.S. federal government debt has surpassed $38 trillion, marking a significant increase from $37 trillion just two months prior [3] - The International Monetary Fund (IMF) predicts that the U.S. general government debt will reach 140% of GDP within four years, an increase of 15 percentage points from 2025 [3] - Scope Ratings has maintained a negative outlook on the U.S. rating since 2023, with analysts highlighting the government shutdown as a "negative credit event" [3]