What is reverse stress testing, and why is it a useful complement to conventional stress tests?
A core Risk & Compliance interview question — asked in analyst and associate interviews across IB, PE, and the Big 4.
THE SHORT ANSWER
Conventional stress testing starts from a scenario and asks 'what's the loss?' Reverse stress testing inverts it: start from the outcome that would render the business unviable — breaching minimum capital, a liquidity failure, loss of a key counterparty — and work backwards to find the combinations of events that would cause it. It's valuable because it forces management to confront plausible paths to failure they might not script in standard scenarios, exposes hidden concentrations and correlation assumptions, and counters the optimism bias of choosing 'survivable' scenarios. Regulators expect it (e.g., under ICAAP/ILAAP) precisely because it tests the boundary of the firm's resilience rather than just a comfortable adverse case.
WHAT INTERVIEWERS LISTEN FOR
- ✓Start from the failure outcome, work back to causes
- ✓Reveals paths to non-viability and hidden concentrations
- ✓Counters optimism bias in scenario selection
- ✓Expected under ICAAP/ILAAP
COMMON MISTAKES
- ✗Describing it as just a more severe normal stress test
- ✗Not knowing the 'start from failure' logic
- ✗Unaware of the regulatory expectation
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