Group 1 - The total amount of tradable U.S. government bonds surpassed $30 trillion for the first time in November, doubling since 2018, with a growth of approximately 0.7% to reach $30.2 trillion [1] - The U.S. Treasury issued $4.3 trillion in government bonds in 2020 to address the impact of the COVID-19 pandemic, resulting in a fiscal deficit exceeding $3 trillion that year [4] - The structural issue of "spending consistently exceeding revenue" has persisted in U.S. public finance for the past 20 years, exacerbated by the issuance of large amounts of debt at higher interest rates post-pandemic [4] Group 2 - The fiscal deficit is projected to decrease to approximately $1.78 trillion for the fiscal year 2025, largely due to significant revenue from tariffs this year [4] - Interest costs are rapidly increasing, with debt interest expenditures expected to reach $1.2 trillion in the fiscal year 2025 [4] - Revenue from tariffs is estimated to be between $300 billion and $400 billion, which is still lower than the current interest expenditures on existing debt, indicating a deteriorating fiscal situation [8] Group 3 - The total U.S. national debt reached $38.4 trillion as of November, which includes obligations to Social Security trust funds and savings bond holders [8] - The current debt ceiling approved by Congress is $41.1 trillion, which covers the total national debt [8] - The Treasury has maintained stable auction sizes for most long-term bonds over the past two years and has begun to consider the possibility of future issuances [8]