Combine extreme safety with extreme risk and refuse the middle: floor the downside absolutely, leave the upside open.
The middle is where you get the worst of both: still able to ruin you, and capped in what it can return. The strategy assumes you can afford a safe end, which not everyone can.
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Typed edges. Anything below the line was authored on the other note and derived here.
example-of →Robust survives shocks; antifragile gains from them — so ask not whether a thing will break but which way volatility moves it.The most concrete implementation of convexity available to an individual: capped losses, uncapped gains, no exposure in between.
extends →Buy far enough below your estimate of value that being materially wrong about the estimate still leaves you whole.Graham's buffer protects one position. The barbell applies the same instinct to the whole portfolio and then adds the part Graham had no use for — a deliberately convex tail.
← supported byA small chance of ruin is not a small risk — once you are out of the sequence, the expected value you would have collected goes with you.
The barbell exists precisely to make the absorbing state unreachable. Without the ruin argument it looks like conservatism; with it, it is the only coherent structure.