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I.e., $100 decreased by 20% requires an increase of (1/(1-0.2))-1) to return to $100. Is there a simple name that refers to this?

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Is this about leveraged ETFs? :) –  fennec Mar 1 '11 at 6:43

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Well, in math terms, it's the reciprocal. A 20% drop (80% of original value) needs a 25% increase to break even. .8 and 1.25 are reciprocals.

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Ha. Yeah, I guess it is that simple. Thanks. –  tgrass Mar 1 '11 at 13:54

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