美联储-为什么收益率曲线可以预测GDP增长？银行的作用（英）-2023.7-62页_626kb

Why Does the Yield Curve Predict GDP Growth? The Role of Banks

The paper examines the link between the yield curve and GDP growth, specifically focusing on the role of banks. The key findings are:

Key Findings and Contributions

1. Expected Bank Profitability Channel: A steeper yield curve is associated with higher term premiums rather than higher expected short rates. An increase in term premiums boosts bank profits (net interest margins and returns on equity) and increases loan supply, particularly among banks with higher leverage (lower capital ratios).

2. Heterogeneous Effects by Bank Leverage: More leveraged banks respond more strongly to term premium shocks, increasing lending activity more than less leveraged banks. This amplifies the effect of yield curve steepening on bank lending and real economic activity.

3. Causal Evidence: The study employs multiple identification strategies (instrumental variables using foreign official holdings of U.S. Treasuries and high-frequency event study shocks) to isolate causation from correlation.

Policy Implications

• Yield curve-driven monetary policy actions (e.g., quantitative easing) may have unintended negative effects on bank profitability and credit supply if not properly calibrated.
• Decomposing Treasury yields into expectations and term premiums highlights an important channel through which banks respond to long-term interest rates, extending beyond traditional monetary transmission routes.

Statistical Evidence

• A one-standard deviation increase in the term premium (⁠~ 50 basis points) is associated with up to 1.3 percentage points higher loan growth.
• More leveraged banks (at the 25th percentile vs. 75th percentile) increased new loan volume by 11% less expensively during the "taper tantrum" period in 2013.