身边的经济学·社会常识英语精读30篇（3）

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公共债务可持续性：超越 headline 比率的深层维度

A debt-to-GDP ratio below 60% offers no automatic safety guarantee if most borrowing funds short-term consumption rather than productive public investment.
Sustainability hinges on currency denomination, maturity structure, and primary fiscal balance—not just aggregate stock figures reported quarterly.
Emerging economies face greater rollover risk when foreign-currency debt exceeds export earnings, regardless of headline ratios.
Domestic debt held by pension funds or central banks behaves very differently from market-held sovereign bonds during stress episodes.
Debt service costs matter more than total stock: rising interest rates can destabilize budgets even with static debt levels.
Countries with indexed bonds, long maturities, and credible fiscal councils show lower yield volatility despite similar debt ratios.
Hidden liabilities—such as unfunded public pension obligations or contingent liabilities from state-owned enterprise guarantees—distort official sustainability assessments.
Fiscal space erosion often begins not with deficits but with declining revenue elasticity amid structural economic shifts.
Debt sustainability frameworks now incorporate climate exposure metrics, recognizing physical and transition risks as fiscal shock multipliers.
Ultimately, debt is sustainable only when servicing it does not crowd out essential public functions or constrain countercyclical capacity.