Why is the contractual maturity of deposits misleading for liquidity risk, and what is behavioral modelling?
A core Risk & Compliance interview question — asked in analyst and associate interviews across IB, PE, and the Big 4.
THE SHORT ANSWER
Many deposits are contractually on-demand or short-dated, so a purely contractual liquidity view assumes they could all leave tomorrow — yet in practice a large, stable 'core' of retail and operational deposits stays for years. Behavioral modelling estimates how deposits actually behave: it segments them (retail vs corporate, insured vs uninsured, operational vs excess, relationship vs rate-shopping) and assigns empirical decay/stickiness and run-off rates, so the liquidity profile reflects realistic, not worst-contractual, outflows. It matters because both internal liquidity management and regulatory metrics (the LCR's run-off assumptions, NSFR's stable-funding weights, ILAAP) depend on these behavioral assumptions — overestimate stickiness and you under-hold liquidity; underestimate it and you carry costly excess buffers. The risk is that behavior breaks in stress (a run, or uninsured deposits fleeing as in recent bank failures), so behavioral models must be stressed and the assumptions challenged, especially for uninsured and digitally-mobile deposits.
WHAT INTERVIEWERS LISTEN FOR
- ✓Contractual view overstates outflows (ignores stable core)
- ✓Behavioral modelling segments deposits and applies empirical run-off
- ✓Feeds LCR run-off, NSFR weights, ILAAP
- ✓Behavior breaks in stress — stress-test assumptions, esp. uninsured
COMMON MISTAKES
- ✗Using contractual maturity for liquidity risk
- ✗Overestimating deposit stickiness
- ✗Not stressing behavioral assumptions
Reading isn't the same as answering under pressure.
Interviewers don't hand you the model answer — you deliver yours on a clock. Practice this and 1,000+ questions with AI feedback on every answer.
RELATED QUESTIONS
- Explain the COSO ERM framework.
- Explain risk appetite versus risk tolerance.
- What is the primary purpose of the ICAAP under Basel?
- Explain the three lines of defense model and its role in risk management.
- What is the purpose of the ICAAP under Basel?
- What is the difference between a risk appetite statement and a risk limit?