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Cambridge Definition
the amount that can be produced by adding one unit of something, such as labour, to the production process, or the added profit that this produces
Cambridge Link
MARGINAL PRODUCTIVITY – Cambridge English Dictionary
Wikipedia Definition
In economics and in particular neoclassical economics, the marginal product or marginal physical productivity of an input (factor of production) is the change in output resulting from employing one more unit of a particular input (for instance, the change in output when a firm's labor is increased from five to six units), assuming that the quantities of other inputs are kept constant.[1]