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Drawdown
The decline from the last peak to the following low, in percent.
Drawdown shows how far a security or a portfolio has fallen from its last high. If a share falls from 100 € to 70 €, the drawdown is 30 %.
Note the asymmetry: after −30 % it takes +43 % to get back to where you were, after −50 % even +100 %. That is why many investors try to limit large drops in a single position, for example with a stop.