marginal utility

noun Economics.
the extra utility or satisfaction derived by a consumer from the consumption of the last unit of a commodity.

Origin:
1920–25

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
There were critics who would say this was all trivial tinkering, modest stuff
  of marginal utility.
Per-page marginal utility, it's true, is unusually high.
The company was based on economic theory-specifically, on the idea of declining
  marginal utility.
Because of diminishing marginal utility, income redistribution from the rich to
  the poor is a key part of the utilitarian's plan.
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