Group 1 - The relationship between population aging and government debt accumulation is a central theme at the Jackson Hole global central bank conference, highlighting the structural logic behind the long-term decline in interest rates and the rise in government debt [2][3] - Aging populations lead to increased fiscal expenditures, such as rising pension payments and healthcare costs, which create a long-term basis for fiscal deficits and an upward trend in government debt [2][3] - Despite the fiscal burden, aging also expands the demand for safe debt assets, allowing governments to issue large amounts of debt at very low interest rates, creating a "high debt—low interest" equilibrium [2][3] Group 2 - The sustainability of this "high debt—low interest" equilibrium is fragile and depends on factors beyond demographic changes, including the sensitivity of interest rates to debt levels, international capital flows, and political stability [4][5] - The sensitivity of interest rates to debt (Debt Sensitivity to Interest Rates, DSIR) may be underestimated, with potential implications for fiscal sustainability if debt levels rise significantly [4] - Global demand for U.S. Treasury securities is not guaranteed, and geopolitical tensions or the rise of alternative reserve currencies could undermine the current reliance on U.S. debt [5] Group 3 - Fiscal crises can arise from "flow shocks" rather than unsustainable debt levels, with sudden events like auction failures or political deadlock posing significant risks [6] - The current "high debt—low interest" equilibrium provides short-term economic support but is not a sustainable long-term solution, necessitating structural fiscal reforms to stabilize market confidence [6][8] - Improving labor productivity is essential to alleviate the pressures of an aging population, and structural fiscal adjustments can help restore long-term growth momentum [8]