marginalism
C2CEFR level
85/100Rarity: very rare
TechnicalRegister
The economic doctrine that value and decisions are governed by incremental utility or cost rather than by totals.
A marginalist reframing showed the airline should sell its last empty seats at any fare above the marginal cost of carrying one more passenger.
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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