'''Marginal [[product]]''' (or '''marginal physical product''') is the increase in total output due to an increase in one unit of [[input]]. It is defined as the change in total product, divided by the change in a [[variable]] input. | '''Marginal [[product]]''' (or '''marginal physical product''') is the increase in total output due to an increase in one unit of [[input]]. It is defined as the change in total product, divided by the change in a [[variable]] input. |