decay
A2CEFR level
15/100Rarity: common
TechnicalRegister
The gradual erosion of an option's value as it approaches expiry.
Time decay worked in the seller's favour, nibbling away at the premium each day.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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