Risk First
Updated 2026-08-11
INTRODUCTION
English translation pending.
CORE DEFINITION
Risk first is the decision rule, central to Munger's investing, that the first question is not what a decision can earn but what it can destroy. Its core claim is that avoiding irreversible loss takes priority over maximising expected return, because compounding is asymmetric: a fifty per cent drawdown requires a hundred per cent gain to recover, while a permanent loss ends all future participation. The key qualification is that this is not risk avoidance; it accepts calculated volatility and rejects only exposures that could remove you from the game, which is why Munger described avoiding stupidity as more reliable than seeking brilliance.
SCAFFOLDING EFFECT
Reduce cognitive load
- Downside first: Write the worst realistic outcome before estimating any upside or expected return. - Reversibility test: Ask whether that outcome can be recovered from or ends your participation. - Exposure cap: Reduce the position size until the irreversible scenario becomes survivable for you.
Anchor fast decisions
Compounding is asymmetric, since losing half requires doubling to get back, and an irreversible loss ends every future opportunity. Defining the worst case first stops you from staking the whole position while chasing returns, so preserving the ability to keep playing is itself the highest-priority return.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- mungermodels.comhttps://mungermodels.com/models/risk-firstverified
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