endogenous
C2CEFR level
85/100Rarity: very rare
TechnicalRegister
Arising from within the system or determined by other variables in the model.
Price was endogenous here, since the firm set it in response to the very demand they were trying to measure.
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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