Quarterly Scenario Rehearsal
Pre-plan portfolio responses before extreme events become real
- Difficulty
- Moderate
- Time to result
- ~weeks to results
- Steps
- 6
- Confidence
- 99%
Quarterly Scenario Rehearsal prepares a team for low-probability, high-impact events by deciding responses before emotions and market pressure intensify. The team identifies unusual but plausible scenarios, such as a major bank failure, an oil-price shock, or military escalation. Members trace how each event could affect issuers, liquidity, interest rates, and portfolio duration. They then specify concrete actions: which bonds to buy or sell and whether to shorten or lengthen duration. Formal quarterly sessions preserve discipline, while informal meetings can be triggered by news that suggests a changed environment. The output is not a prediction that an event will occur; it is a rehearsed response map that accelerates coordinated action if it does.
Origin
Luis Maizel explained LM Capital Group's formal and informal scenario-planning practice on Masters in Business.
Core principles
- 01Consider unlikely events before they become urgent
- 02Translate each scenario into specific portfolio actions
- 03Rehearse decisions to reduce surprise and delay
- 04Involve the whole team in challenging assumptions
- 05Combine scheduled reviews with informal event-driven sessions
How to run it
- 1
Generate extreme scenarios
List unusual but credible events that could materially affect the portfolio. Include financial, geopolitical, commodity, and institutional shocks.
Pro tip Include scenarios that feel uncomfortable rather than only familiar market moves.
Watch out Avoid spending time on events with no plausible transmission to the portfolio.
- 2
Trace the consequences
Map how each event could affect rates, currencies, credit quality, liquidity, and specific holdings. Distinguish immediate effects from second-order consequences.
Pro tip Assign team members to argue for competing causal paths.
Watch out A scenario label without a transmission mechanism is not actionable.
- 3
Choose portfolio responses
Specify which securities or exposures the team would buy, sell, retain, or hedge. Decide whether duration should be shortened or lengthened.
Pro tip Write conditional actions in an explicit if-event-then-response format.
Watch out Vague intentions such as 'reduce risk' will not speed decisions during a crisis.
- 4
Identify decision triggers
Define evidence that would indicate the scenario is occurring and justify action. Separate early warnings from confirmation signals.
Pro tip Use observable market or news indicators whenever possible.
Watch out Acting on every rumor can create unnecessary turnover.
- 5
Run the team rehearsal
Bring the team together to challenge the scenario, response, and assumptions. Use a shared board or document to make dependencies visible.
Pro tip Invite operations and trading perspectives, not only portfolio managers.
Watch out Consensus achieved too quickly may indicate insufficient challenge.
- 6
Refresh continuously
Replay scenarios formally each quarter and hold informal sessions when relevant news emerges. Update responses as holdings and market structures change.
Pro tip Retire scenarios that no longer affect the portfolio and add newly relevant ones.
Watch out A stale response plan can be more dangerous than having no plan.
In the wild
A bond team models the bankruptcy of a major money-center bank. It maps counterparty exposure, possible liquidity stress, and likely demand for safer government bonds, then predefines which holdings to sell and how duration should change if specified warning signals appear.
→ The team can respond more quickly and consistently if a systemically important bank deteriorates.
The team separately rehearses oil falling below twenty dollars and rising above one hundred dollars. It identifies vulnerable sovereign and corporate issuers, potential beneficiaries, currency effects, and the trades appropriate to each direction.
→ Energy-sensitive exposures receive distinct response plans for opposite commodity shocks.
Common mistakes
Predicting instead of preparing
The purpose is to prepare conditional responses, not claim certainty that a particular extreme event will occur.
Stopping at discussion
A scenario session creates little value unless it ends with explicit actions, triggers, and ownership.
Rehearsing only once
Portfolio holdings and market conditions change, so old scenario responses quickly become stale.
Is it for you?
Best for
It is best for investment teams managing portfolios exposed to macroeconomic, geopolitical, commodity, or financial-system shocks.
Not ideal for
It is not ideal as a substitute for normal diversification, position limits, or real-time judgment during an unprecedented crisis.
From the transcript
“We think of all the weird things that could happen, very all the weird things that could happen.”
“we tried to play through what our reaction would be to that event, so we're not caught by surprise if God forbid they happen.”
“we replay scenarios almost I mean formally once a quarter.”
From the episode
Luis Maizel Discusses Diversity in Finance
Luis Maizel