judgement
The Ludic Fallacy
The rule
Real life is not a tidy casino game with known odds. Neat models miss the messy chances that actually hurt you, so leave room for surprise.
Where it flips
This lesson can slide into rejecting all models and all numbers as useless. So keep the models as scaffolding, but distrust their tidy edges. Use good numbers, plus honest humility about what they leave out.
In a game of dice the odds are fixed and known, so the maths is clean. Markets are not like that. The rules themselves can change, and the worst outcomes are not in the rulebook. When a model gives you a crisp number, remember it is answering the tidy question it was built for, not the wild one reality will ask. So use the numbers as a rough guide. Then leave a wide margin for everything the model could never have imagined.
A worked example
Aarvi trusts a risk tool that reports her portfolio is '99% safe'. She does not realise its clean maths never thought about a currency shock. And that is exactly the event that lands. [illustrative]
How to spot it
- ·a precise chance quoted with false confidence
- ·'the model says it's 99% safe'
- ·real-world mess forced into a clean formula
Nassim Nicholas Taleb · Fooled by Randomness