• Global Frameworks: Bank for International Settlements (BIS) Basel Committee on Banking Supervision Standards.

1. The Basel Capital Accord Evolution
The Basel Committee establishes international safety standards for commercial banking operations to minimize systemic global financial risks.
       ┌───────────────── The Three Interconnected Basel Pillars ─────────────────┐
       ▼                                         │                                ▼
[Pillar 1: Minimum Capital]            [Pillar 2: Supervisory]          [Pillar 3: Market Discipline]
Risk-Weighted Asset ratios;            Independent regulatory review    Mandatory public risk factor
Tier 1 and Tier 2 capital thresholds.  of risk modeling and strategy.   and balance sheet disclosures.

2. Capital Adequacy Calculation Frameworks (Pillar 1)
Banks must maintain regulatory capital reserves that scale directly with the riskiness of their assets, measured via Risk-Weighted Assets (RWA). Total RWA aggregates exposure across three main risk categories: Credit Risk, Market Risk, and Operational Risk.
  • Capital Adequacy Ratio (CAR):

    CAR = (Tier 1 Capital + Tier 2 Capital) / Total Risk-Weighted Assets (RWA) ≥ 8.0%
  • Capital Quality Definitions:
    • Tier 1 Capital (Core Capital): Highest quality, loss-absorbing capital. It is primarily composed of Common Equity Tier 1 (CET1), which includes common stock, retained earnings, and accumulated other comprehensive income.
    • Tier 2 Capital (Supplementary Capital): Lower-quality capital, including subordinated debt instruments, hybrid capital structures, and general loan-loss allowances.

3. Post-Crisis Capital Buffers and Liquidity Metrics
Following systemic market disruptions, the Basel III framework added capital buffers and explicit liquidity requirements:
  • Capital Conservation Buffer (CCB): An extra 2.5% CET1 capital requirement above the 8% minimum, designed to absorb losses during periods of economic distress.
  • Liquidity Coverage Ratio (LCR): Mandates that banks hold sufficient High-Quality Liquid Assets (HQLA)—such as cash or central bank reserves—to survive a severe 30-day market stress scenario:

    LCR = (Stock of HQLA) / (Total Net Cash Outflows over 30 Days) ≥ 100%
  • Net Stable Funding Ratio (NSFR): Requires banks to maintain a stable funding profile relative to the composition of their assets over a one-year horizon to reduce reliance on volatile short-term wholesale funding.

 
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