Government debt ratios have reached historically elevated levels across nearly every category of economy. The combination of the 2008 financial crisis, the pandemic fiscal response, and ongoing structural deficits has pushed debt levels into territory that would have been considered crisis-inducing a generation ago. Yet the economic consequences have varied enormously depending on who holds the debt, what currency it's denominated in, and how fast the economy is growing.
Japan is the paradigmatic case. At over 250% of GDP, its debt ratio is the highest among major economies by a wide margin. Yet Japan borrows almost entirely in yen from domestic investors (largely its own central bank and pension funds), pays near-zero interest rates, and has never faced a market-driven funding crisis. This suggests that domestic-currency debt held by domestic institutions operates under fundamentally different dynamics than foreign-currency debt held by international investors.
The US fiscal trajectory has become a growing concern. Debt has roughly doubled as a share of GDP since 2008, driven by financial crisis bailouts, tax cuts, pandemic spending, and structural entitlement obligations. Unlike Japan, a significant share of US debt is held by foreign investors, including foreign governments. The dollar's reserve currency status provides a unique cushion, but rising interest payments (now exceeding defense spending) create fiscal pressure.
For developing countries, the debt picture is most alarming. Many borrowed heavily during the low-interest-rate era of 2010-2021, often in dollars or euros. When rates rose and currencies depreciated, debt service costs exploded. Several countries (Sri Lanka, Ghana, Zambia) have already defaulted or restructured. The risk of a broader emerging market debt crisis is the most significant macroeconomic threat beyond individual country borders.