noun, Economics.
the cost of one additional unit of any item produced or bought in quantity.

The change in total cost of production when an output is varied by one unit.


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  • Marginalia

    [mahr-juh-ney-lee-uh, -neyl-yuh] /ˌmɑr dʒəˈneɪ li ə, -ˈneɪl yə/ plural noun 1. marginal notes. /ˌmɑːdʒɪˈneɪlɪə/ plural noun 1. notes in the margin of a book, manuscript, or letter n. 1832, from Latin marginalia, neuter plural of adjective marginalis “marginal,” from marginis (see margin).

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