sunk-cost fallacy
B2CEFR level
50/100Rarity: uncommon
TechnicalRegister
The error of persisting with an endeavour because of resources already spent rather than its future value.
The sunk-cost fallacy kept the failing project alive because the firm had already poured millions into it.
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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