marginal cost

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

1925–30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Cultural Dictionary

marginal cost definition

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

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Example sentences
The marginal cost of that extra customer is near zero.
The marginal cost of expansion all comes from tuition.
Since the libraries are already there and the marginal cost of additional users
  is zero, the neighbors should be thrilled.
Even when something does get through, the marginal cost of that fifty-ninth or
  sixtieth vote is severe.
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