Cutting Losses, Letting Winners Run
Two separate psychological disciplines Livingston credits for his biggest gains — and blames himself for abandoning during his worst losses.
A specific discipline Livingston repeatedly credits for his biggest successes, and repeatedly blames himself for abandoning during his worst losses: cut a losing position quickly, before a small, manageable loss grows into a large, dangerous one, and let a winning position run for as long as the underlying trend and reasoning remain intact, rather than taking a small profit prematurely out of impatience or fear.
He's specific about the psychological difficulty of actually doing this consistently — cutting a loss requires admitting, in real time, that a specific decision was wrong, which is uncomfortable in exactly the way ego and ordinary human psychology make it uncomfortable; letting a winner run requires resisting the pull to lock in a smaller, certain gain rather than risk giving some of it back, even when the underlying reasoning for holding remains sound.
This is one of the book's most directly, explicitly repeated lessons — Livingston states it plainly multiple times across the narrative, and traces several of his own largest losses directly back to specific instances of failing to apply it, most often by holding a losing position too long out of stubbornness or hope.
| Cutting losses quickly | Letting winners run | |
|---|---|---|
| What it requires | Admitting, in real time, that a specific decision was wrong | Resisting the urge to lock in a smaller, certain gain out of fear |
| The psychological pull against it | Hope that the position will recover, avoiding the discomfort of admitting error | Fear of giving back an existing paper gain |
| Livingston's own record | Credits this discipline for his largest gains | Blames abandoning it for several of his largest losses |
Closing a losing position at a small, defined loss requires accepting, immediately and concretely, that a specific decision was wrong.
This is a much sharper and more immediate form of discomfort than simply watching an open position drift lower while telling yourself it will probably recover — which is precisely why so many investors let small losses grow into large ones through simple avoidance of that sharper, more immediate discomfort.
The instinct to lock in a gain — converting an uncertain paper profit into a certain, realized one — is a completely different psychological pull than the one covered above, driven by fear of loss rather than avoidance of admitting error, and Livingston's own account treats mastering both pulls as two separate, equally necessary disciplines rather than two versions of the same lesson.
- Cutting losses quickly requires admitting a specific decision was wrong, in real time — a sharp, immediate discomfort many investors avoid.
- Letting winners run requires resisting a different pull entirely: the fear of giving back an existing paper gain.
- Livingston explicitly credits the first discipline for his largest gains and blames abandoning it for several of his largest losses.
- These are two separate skills driven by two different psychological pulls, not one single lesson applied twice.