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MENTAL MODEL · M3495

Debt Sustainability

Debt Sustainability
BusinessHigh supportPublic Economics
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Updated 2026-08-05

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INTRODUCTION

English translation pending.

CORE DEFINITION

Debt sustainability asks whether a borrower can service its obligations indefinitely without default, rescheduling, or endless refinancing. The standard framework used by the IMF and other institutions tracks the debt-to-GDP ratio through the relation that its change equals the primary deficit plus the gap between the interest rate r and the growth rate g multiplied by the existing debt ratio. When growth exceeds the interest rate, an economy can dilute a given debt burden; when r exceeds g and primary deficits persist, the ratio diverges. Maturity structure and currency composition are essential qualifiers.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Fiscal risk scan: Compare the interest rate with the growth rate before reading any headline debt number. - Refinancing check: Inspect maturity and currency structure to see how fast a shock can bite. - Threshold setting: Define the debt ratio and the scenario that would force fiscal adjustment.

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Debt sustainability is arithmetic before it is politics. Growth raises the denominator, so an economy expanding faster than its interest rate dilutes the burden of an existing stock. When the interest rate exceeds growth, the same stock compounds faster than the economy can outgrow it, and only primary surpluses can stabilise the ratio. Currency matters because debt in foreign currency cannot be inflated away, and maturity matters because short maturities turn a solvency question into a liquidity one.

MINIMUM ACTION

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Source support: Explicit

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    baike.baidu.comhttps://baike.baidu.com/item/%E5%80%BA%E5%8A%A1%E5%8F%AF%E6%8C%81%E7%BB%AD%E6%80%A7ZH · Explicit
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