2023-05-17-国际清算银行-长期债务传播和实际逆转（英）_54页_673kb

Long-term Debt Propagation and Real Reversals: Summary of BIS Working Paper

This paper analyzes the propagation mechanism of long-term debt and its real effects on economic activity. The core finding is that long-term debt creates a predictable hump-shaped path of future debt service payments (s), which substantially affects real output. Specifically:

• New Borrowing: A unit increase in new household borrowing (b) boosts GDP growth by approximately 12 basis points in the baseline model.
• Debt Service: A unit increase in debt service reduces GDP growth by about 19 basis points.

These flows lead to predictable real reversals several years after credit booms, with debt service lagging new borrowing by about 4-7 years. The propagation mechanism arises from two key features of long-term debt:

• Auto-correlated new borrowing (persistent borrowing over time).
• Mortgages and consumer loans (longer maturities).

Empirical Evidence

• A novel cross-country dataset for 16 advanced economies (1980–2019) confirms the lead-lag relationship between new borrowing and debt service.
• The propagation is robust across different specifications, country sub-samples, and sets of control variables.
• Long-term debt propagation accounts for much of the predictive power of credit cycle indicators for future output.

Real Effects

• New borrowing increases output, while debt service decreases it, leading to endogenous reversals.
• Effects accumulate over time due to persistence in both variables.
• Policy implications highlight the trade-off between stimulating short-term growth and mitigating future debt service costs.

Broader Implications

• The paper underscores the importance of tracking financial flows (new borrowing and debt service) for real-time forecasting and policy-making.
• It calls for improved measurement of debt maturity and amortization schedules to better model financial cycles.

In conclusion, long-term debt propagation is a key driver of real economic fluctuations, offering a robust framework for understanding credit cycles and guiding policy.