What-If Scenario Precommitment
Map adverse scenarios and responses before market pressure arrives
- Difficulty
- Easy
- Time to result
- ~days to results
- Steps
- 5
- Confidence
- 99%
What-if scenario precommitment converts uncertainty into a set of prepared conditional responses. Before taking risk, the investor identifies several ways news, prices, or market conditions could evolve. For each scenario, the investor states what the development would imply, how the position should change, and which observable criteria would prove the original idea wrong. The exercise also anticipates emotional reactions such as fear, panic, or attachment so they are recognized rather than obeyed automatically. Writing the map in advance creates a line in the sand and reduces the temptation to invent excuses after losses appear. The plan remains adaptable, but changes should follow new evidence rather than pressure generated by the position itself.
Origin
Extracted from Masters in Business, where Brett Steenbarger recommends mapping news, price, and invalidation scenarios before they unfold.
Core principles
- 01Preparation must cover multiple plausible futures
- 02Every thesis needs observable invalidation criteria
- 03Responses are easier to execute when decided in advance
- 04Emotional reactions can be rehearsed as well as operational actions
How to run it
- 1
Identify Key Uncertainties
List the events, data, and market behaviors that could materially affect the idea. Include both favorable and adverse possibilities.
Pro tip Prioritize uncertainties capable of changing the thesis, not every imaginable headline.
Watch out A plan containing too many scenarios becomes unusable under pressure.
- 2
Build Distinct Scenarios
Describe several plausible outcomes and the evidence that would indicate each is occurring. Make the scenarios concrete enough to recognize in real time.
Pro tip Include at least one outcome that contradicts your preferred view.
Watch out Do not assign all unpleasant outcomes an implausibly low probability.
- 3
Define Invalidation Criteria
Specify price behavior, facts, or structural changes that would make the thesis wrong. Record these criteria before committing capital.
Pro tip Use multiple criteria when no single signal is decisive.
Watch out If nothing can prove the idea wrong, it is an ideology rather than a testable investment thesis.
- 4
Preselect Responses
Decide how you will resize, exit, hold, hedge, or investigate under each scenario. Make the response proportionate to the quality of evidence.
Pro tip Write responses as if-then rules.
Watch out Avoid plans that rely on making a calm decision only after panic has begun.
- 5
Rehearse the Pressure
Imagine both the operational event and your likely emotional reaction. Practice recognizing that state and executing the planned response.
Pro tip Use calm breathing or meditation during rehearsal.
Watch out Rehearsal should prepare action, not create false certainty about what will happen.
In the wild
Before an earnings release, an investor maps strong results with weak guidance, weak results with improving margins, and a full thesis break. For each combination, the investor defines the evidence required and a position-size response. The investor also anticipates reluctance to sell after a gap down.
→ When the thesis-breaking scenario occurs, the investor exits according to the written plan instead of rationalizing the loss.
A team rehearses not only its preferred route but what it will do and feel if the route becomes blocked. The emotional rehearsal makes surprise and panic more manageable when a contingency occurs.
→ The team can execute an alternative plan under pressure with less emotional disruption.
Common mistakes
Planning Only the Preferred Outcome
This reinforces confirmation bias and leaves the investor unprepared for adverse evidence.
Using Vague Invalidation Rules
Criteria such as selling when things look bad can be reinterpreted indefinitely after losses begin.
Ignoring Emotional Responses
Knowing the correct action is insufficient if fear, ego, or attachment prevents its execution.
Is it for you?
Best for
It is best for investors making consequential decisions under uncertainty and time pressure.
Not ideal for
It is not ideal as a substitute for flexible judgment when genuinely novel information changes every prior assumption.
From the transcript
“I think it's very helpful to do what if scenario planning”
“What would tell you your idea is wrong? Criteria A, B, C, D.”
“And mapping that out in advance so that if those things should unfold, you're prepared psychologically to take property.”
From the episode
Interview With Brett Steenbarger: Masters in Business (Audio)
Brett Steenbarger