Capital Adequacy Ratio

Why It Matters

Because CAR directly reflects a bank’s loss‑absorbing buffer, it informs regulator interventions, shapes investor confidence, and helps prevent banking crises that can destabilize economies.

Key Takeaways

• Capital adequacy ratio measures banks' loss‑absorption capacity against potential defaults
• Ratio = regulatory capital divided by risk‑weighted assets
• Basel III sets minimum 8% requirement plus additional buffers
• Low CAR can trigger bank failures, runs, systemic risk
• Regulators use CAR to compare financial health across countries

Summary

The episode of “The Economy, How Do You Measure That?” breaks down the capital adequacy ratio (CAR), the benchmark that regulators use to gauge a bank’s ability to absorb losses and protect depositors.

CAR is calculated by dividing a bank’s regulatory capital—primarily Tier 1 equity and retained earnings, plus Tier 2 subordinated debt—by its risk‑weighted assets, which assign higher weights to riskier loans. A simple example shows a bank with $10 million of regulatory capital and $100 million of risk‑weighted assets yields a 10 % CAR, comfortably above the Basel III minimum of 8 % and any national buffers.

The hosts cite the 2007‑08 crisis, Northern Rock, and the 2023 Silicon Valley Bank collapse as vivid reminders that low CAR can spark runs and systemic panic. They also highlight the Basel framework’s tiered capital definitions and the “trapeze‑artist” analogy that illustrates how capital cushions a bank when assets sour.

For policymakers, CAR is a trigger for supervisory actions, ranging from capital‑raising mandates to outright closure, and it enables cross‑country comparisons of financial stability. For consumers, a robust CAR means greater confidence that deposits are safe, reinforcing the overall resilience of the banking system.

Original Description

How do we know whether banks are safe? In this episode of The Economy – How Do You Measure That?, Jim Tebrake and Mahmut Kutlukaya explain how the capital adequacy ratio (CAR) shows a bank’s ability to absorb losses—and why it matters for your deposits. Watch the video to see how trust in the banking system is measured behind the scenes.