Charlie Munger spent sixty years answering a question almost nobody asks.
Not “how do I succeed.” He found that one intractable, and said so repeatedly. Success has too many paths, most of them unrepeatable, most of them contaminated by luck. Ask a hundred successful people how they did it and you get a hundred answers, all of them sincere, none of them a method.
He asked instead: what would guarantee failure? Then he did not do those things.
Failure, it turns out, is a small and well-lit room. Its exits are few and its furniture is always the same. And the extraordinary thing about trading is that every item in the room has already been measured.
Write the recipe
Sit down and complete this sentence ten times. Be specific. Be honest. Nobody is reading it.
“To destroy this account as quickly as possible, I would…”
Most traders produce a list very close to the following, and produce it in about four minutes, which should tell you something about how well they already know the answer.
The recipe for certain ruin
1. Risk far more than one percent, so that a normal losing run is fatal.
2. Enter without a stop, so the loss is decided by the market rather than by me.
3. Move the stop when it is nearly touched.
4. Add to the position while it is losing.
5. Take the winners early and let the losers work.
6. Increase size immediately after a loss, to recover it.
7. Hold three positions that are secretly the same position.
8. Change the system during a drawdown.
9. Trade tired, angry, or bored.
10. Keep no record, so that none of the above is ever visible.
Ten items. You wrote them without effort, and you have done at least four of them this year.
Now try to write the forward version. “To make money reliably, I would…” Go on. You will find it much harder, and what you produce will be vaguer, longer, and full of words like consistently and properly that mean nothing and commit you to nothing.
That asymmetry is the entire method. The negative list is specific because failure is specific. The positive list is vague because success is not one thing.
Every line has a price tag
What makes the trading version of inversion unusually powerful is that the recipe is not folklore. It is arithmetic.
| Line of the recipe | What it actually costs |
|---|---|
| Risk too much | Above 20.4% per trade, a permanently positive edge has a permanently negative growth rate. The account goes to zero on arithmetic alone. |
| Take winners early | Cutting 2R winners at 1.2R, while honouring every stop, turns +20R a year into −12R. |
| Change the system in drawdown | A good system exceeds a 10% drawdown 77.9% of the time. You will change it almost every year, for no reason. |
| Size up after a loss | At a 40% win rate, six consecutive losses arrive 87.2% of the time within a hundred trades. You are scaling into the certainty. |
| Keep no record | Without it, none of the four numbers above can be computed for your own system. The tenth line is what makes the other nine invisible. |
Look at the last row again. Item ten is not one failure among ten. It is the enabling condition for all of them, which is why the trade record turned out to be the root of everything.
Now invert
Negate each line and you have a plan. Not a good plan. Your plan, derived from your own failures rather than from someone else’s success, and specific in exactly the places where a purchased plan is generic.
| Prohibition | Made mechanical |
|---|---|
| Never size above 1% | Position size computed from the stop, before entry. Not chosen. |
| Never enter without a stop | Bracket order at entry. No stop, no fill. |
| Never move a stop against the trade | Resting order. Removing it is a logged rule break. |
| Never add to a loser | All scaling defined at entry, or not permitted. |
| Never size up after a loss | Size is a function of account equity only. |
| Never change the system in drawdown | System changes require a written review, dated, above the 95th-percentile drawdown depth. |
| Never trade the abstention trigger | One condition, written down, that closes the day. |
| Never fail to log | Trade is not closed until it is recorded, in R. |
Every entry in the right-hand column removes a decision from the moment at which you are least able to make it. That is not a coincidence. It is what a rule is for.
The test of a real rule. A rule you can follow while tilted. Anything that requires judgement in the moment is not a rule, it is an intention, and intentions are precisely what the moment is designed to destroy.
Why the inverted plan is better than the forward one
It is falsifiable. “Trade with discipline” cannot be checked. “No position was opened without a resting stop” can be checked tonight, in about ninety seconds, and the answer is yes or no.
It is bounded. The list of ways to lose is short and finite. The list of ways to win is unbounded and mostly unavailable to you. Working on a finite list is tractable.
It is robust to being wrong about your edge. This is the deep one. You may be mistaken about whether your setup works. You cannot be mistaken about whether risking twenty percent per trade kills you, because that conclusion holds for every positive edge, including edges you have not discovered.
It survives contact with a bad year. The forward plan collapses the first time the market refuses to cooperate, because it was built from things that worked. The inverted plan does not depend on anything working. It only depends on things not killing you.
The wider habit
Once you have used it on the account, the tool does not put itself away.
How would I guarantee I never learn anything from this journal? Record only outcomes. Skip the trades I am ashamed of. Never compute anything.
How would I guarantee I fail this prop firm challenge? Trade the maximum permitted size. Take the trade on day one. Treat the drawdown limit as a target rather than a boundary.
How would I guarantee I become dependent on someone else’s signals? Never write down why I took a trade. Then I will have no way to improve, and improvement will always look like finding a better source.
Each inversion produces something you can act on before lunch. Each forward version produces an aspiration.
The point of a small, well-lit room
Munger’s insight was never that avoiding stupidity is more virtuous than pursuing brilliance. It is that avoiding stupidity is knowable, and brilliance is not, and a decision procedure built on what you can know will outperform one built on what you would like to be true.
Trading is unusually kind here. The room is small. The furniture is measurable. Nearly every way to destroy an account has been simulated, priced, and written down, most of it in the last century, some of it in this article.
You do not have to be brilliant. You have to write the list, and then refuse to walk into the room.
Write your ten lines tonight.
Not the plan. The recipe for ruin. The plan is what you get when you cross out every line and keep the negation.
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