What is macroprudential stress testing and how does it differ from the microprudential tests that individual banks run?

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AcadiFi · Accepted Answer

Macroprudential stress testing evaluates the resilience of the entire financial system, not just individual institutions. While microprudential tests ask "will Bank X survive?", ma...

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**Key differences:**

| Dimension | Microprudential | Macroprudential |
|-----------|----------------|-----------------|
| Unit of analysis | Individual firm | Financial system |
| Objective | Firm solvency | System stability |
| Feedback effects | Ignored | Modeled explicitly |
| Fire sale dynamics | Not captured | Central concern |
| Contagion | Excluded | Primary focus |
| Aggregation | Sum of parts | Greater than sum |

**What macroprudential tests capture that micro tests miss:**

1. **Fire sale amplification** — when multiple banks sell the same assets simultaneously, prices decline further than any single bank's model projects
2. **Funding market contagion** — one bank's distress raises funding costs for all banks, creating a system-wide credit contraction
3. **Network effects** — defaults cascade through interbank exposures, derivatives counterparty chains, and payment systems
4. **Procyclicality** — regulatory capital requirements force deleveraging during stress, amplifying the downturn

The Bank of England's system-wide stress test, for example, found that individual bank stress tests showed adequate capital across all major institutions, but when interbank exposures, common asset holdings, and funding market dynamics were modeled jointly, three mid-tier lenders would face simultaneous liquidity shortfalls that could freeze the overnight lending market.

For the FRM exam, the critical insight is that the financial system is not merely the sum of its individual firms. Macroprudential stress testing models the interactions and feedback loops that make systemic crises qualitatively different from isolated bank failures.

What is macroprudential stress testing and how does it differ from the microprudential tests that individual banks run?

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