2010年-BIS国际清算银行_Assessing_the_macroeconomic_impact_of_the_transition_to_stronger_capital_and_liquidity_requirements_-_Interim_Report_68页_988kb

Macroeconomic Assessment Group (MAG) Interim Report Summary

Core Content

The Macroeconomic Assessment Group (MAG), established by the Basel Committee on Banking Supervision (BCBS) and the Financial Stability Board (FSB), was created to assess the macroeconomic impact of the transition to stronger capital and liquidity requirements. The report outlines the findings from a comprehensive analysis using various macroeconomic models and scenarios, focusing on the potential effects on GDP, lending volumes, interest spreads, and monetary policy responses.

Main Quantitative Results

• A 1 percentage point increase in the target tangible common equity (TCE) to risk-weighted assets (RWA) ratio is estimated to lead to a decline in GDP of about 0.19% from the baseline path after four and a half years.
• This decline is composed of:
  • 0.16% from the median GDP decline estimated for specific countries by national authorities.
  • 0.03% from the potential impact of international spillovers, as estimated by the IMF.
• The median lending spread increase is 15 basis points, and the decline in lending volumes is 1.4%.
• Liquidity requirements, modelled as a 25% increase in the holding of liquid assets and an extension of the maturity of wholesale liabilities, result in a median increase in lending spreads of 14 basis points and a 3.2% decline in lending volumes after four and a half years, associated with a 0.08% GDP decline.
• The combined effect of capital and liquidity requirements is less than the sum of individual impacts, due to their interdependence.

Key Findings

• Shorter transition periods (e.g., 2 years) result in a slightly larger temporary GDP loss compared to longer periods (e.g., 4 years), with the maximum loss occurring earlier.
• Monetary policy easing can reduce output losses, especially in models incorporating credit supply constraints.
• The MAG estimates are significantly smaller than those from some banking industry groups, such as the Institute of International Finance (IIF), which estimated a much larger GDP impact.

Methodology and Scenarios

Scenarios Considered

• The MAG focused on two key parameters: capital ratios (specifically TCE to RWA) and liquidity standards (including the liquidity coverage ratio (LCR) and liability duration).
• The transition period was also a key variable, with two-year and four-year implementation horizons examined.
• Common scenarios were used to ensure consistency across models, with the assumption that all capital ratio targets increase in parallel.

Models and Approaches

• The MAG used a two-step approach:
  1. Estimating the impact of capital and liquidity requirements on lending spreads and volumes using statistical relationships and accounting identities.
  2. Using these estimates as inputs into standard macroeconomic forecasting models used by central banks and regulatory agencies.
• Other models, such as DSGE models and reduced-form VAR-type models, were also employed to assess the transitional macroeconomic impact.
• The median outcome was used as the central estimate, with the range of responses also shown to reflect the robustness of the findings.

Factors Not Considered

• Adjustment options available to banks (e.g., retained earnings, equity issuance, liability restructuring) were not fully modelled.
• Non-bank credit channels (e.g., market-based financing) were not included in the analysis.
• Market capacity and international spillovers were partially considered but not fully integrated into all models.
• Non-performing loans, funding market adaptation, bank-specific taxes, and reduction in official support were identified as potential factors that could amplify the impact.

Implications for Transition Period

• The model-based estimates suggest that two- and four-year implementation periods result in similar temporary GDP losses.
• Longer transition periods are likely to mitigate the transitory effects on credit availability and GDP.
• The benefits of stronger capital and liquidity standards (e.g., increased confidence, reduced crisis risk) should start to accrue as soon as reforms are implemented.
• Policymakers are advised to carefully monitor the financial and macroeconomic conditions during the transition.

Conclusion

• The MAG's work highlights the modest but measurable impact of transitioning to stronger capital and liquidity standards on GDP and lending activity.
• The results are presented as robust estimates, based on a median outcome across models and countries.
• The final report will be informed by the Basel Committee's Quantitative Impact Study (QIS), which provides consistent data on the capital and liquidity positions of participating banks.

Summary of Key Points

• Transition Period: Affects the magnitude and timing of GDP impact.
• Capital Requirements: Lead to higher lending spreads and reduced lending volumes, with a modest GDP decline.
• Liquidity Requirements: Also cause spreads to rise and lending to fall, with a smaller GDP impact.
• Monetary Policy Response: Can mitigate the output losses.
• Robustness of Estimates: Based on median outcomes and model diversity.
• Industry Comparisons: MAG estimates are significantly smaller than some banking industry forecasts.
• Non-modelled Factors: May amplify or reduce the impact, depending on regulatory design and economic context.

Final Notes

• The MAG's findings are part of a broader effort to assess the benefits and costs of stronger regulatory standards.
• The Top-down Calibration Group (TCG) is responsible for long-term economic impact assessments, while the MAG focuses on transitional effects.
• The results are intended to inform the calibration of the new standards and the implementation timeline.