Group 1 - China's total debt is approximately $12 trillion, accounting for about 65% of its GDP, which is relatively low compared to the US and Japan [2] - Over 80% of China's debt is directed towards infrastructure projects such as high-speed rail, highways, 5G networks, and automated ports, which are seen as long-term investments [2] - The profitability of projects like the Beijing-Shanghai high-speed rail, generating annual profits in the billions, demonstrates the effectiveness of China's investment strategy [2] Group 2 - Japan's total debt is around $9 trillion, with a debt-to-GDP ratio exceeding 220%, indicating a precarious financial situation [5] - More than 90% of Japan's national debt is held domestically, creating a cycle of internal funding that mitigates external shocks but poses long-term risks [5] - Japan's aging population and rising pension and healthcare costs are significant contributors to its fiscal challenges, leading to a reliance on borrowing to maintain balance [5] Group 3 - The US has a staggering $36 trillion in debt, averaging about $110,000 per citizen, with a significant portion allocated to military spending and social welfare [7] - Political struggles have exacerbated the US debt crisis, with reduced foreign investment in US Treasury bonds indicating challenges to the sustainability of its borrowing model [7] - The US's approach of living beyond its means raises concerns about future economic stability, as interest payments alone exceed $1 trillion annually [7]