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Sovereign Debt
Public Debt to GDP
Definition
The ratio between a country's total government debt and its gross domestic product (GDP). It indicates the government's ability to pay back its debt without taking on more debt. For advanced economies, the "danger zone" identified by Rogoff and Reinhart is often cited at 90%, though many nations now exceed 100%.
Formula / Calculation
Debt/GDP = (Total Public Debt / Annual GDP) × 100
Why It Matters
A rising Debt/GDP ratio in a high-rate environment leads to exponential interest cost growth. If GDP growth is lower than the real interest rate (g < r), the debt ratio grows automatically, requiring either fiscal austerity, inflation, or financial repression to stabilize.
Related Metrics & Intelligence
Related Concepts
Sovereign Rollover Risk
The risk that a government cannot refinance its maturing debt obligations at affordable interest rates. Risk peaks when a large portion of outstanding debt is short-duration (bills), forcing frequent refinancing at prevailing market rates. The US faces a structural rollover challenge: approximately $9.2 trillion of debt matures within 12 months (as of 2024), representing ~33% of the total $34T debt stock.Term Premium
The excess yield that investors demand to hold a long-duration bond instead of rolling a series of short-term instruments. It compensates for duration risk (price sensitivity to rate changes), inflation uncertainty, and fiscal supply risk. The ACM Term Premium Model (NY Fed) estimates this component separately from the expected short rate path over the bond's life.Fiscal Dominance
A regime in which a government's debt burden is so large that monetary policy becomes subservient to fiscal needs — effectively forcing the central bank to keep rates low or monetise debt to prevent insolvency. Named by economist Thomas Sargent in 1981. Unlike monetary dominance (where the central bank controls inflation independently), fiscal dominance constrains the central bank's ability to raise rates even when inflation is elevated, because higher rates worsen debt sustainability.Track Public Debt to GDP live
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