Group 1 - The Federal Reserve's FOMC statement indicates that after the end of balance sheet reduction on December 1, the principal repayments from mortgage-backed securities will be reinvested into short-term Treasury bonds [1] - Starting December 1, all principal payments on maturing U.S. Treasury securities will be extended [1] Group 2 - Concerns are raised about the sustainability of U.S. debt, which has surpassed $38 trillion, suggesting that theoretically, it would take 100 years to repay the principal [3] - The Federal Reserve's intervention through reinvestment operations is seen as a way to delay the fiscal challenges faced by the Treasury, indicating a potential erosion of the dollar's credit foundation [3] - The potential consequences of a breakdown in the principle of debt repayment could lead to a reset of the dollar and significant turmoil in the global monetary system [3]