the increase in output resulting from the use of an additional unit of an input or factor of production.
In a production function, the marginal product of a factor is the increase in output due to a unit increase in the input of the factor; that is, the partial derivative of the production function with respect to the factor. In a competitive equilibrium, the equilibrium price of any factor is its marginal value product in every sector where it is employed.
The addition to total output due to the addition of the last unit of an input (when the quantity of other inputs is held constant).
The change in total product that results from a one-unit increase in the quantity of labor employed. (p. 264)
the amount by which output increases with the addition of one unit of an input
refers to the change in total output produced by adding one unit of variable input, with all other inputs being held constant. The input most frequently associated with marginal product is labor.
In economics, the additional quantity of total output following from a one-unit increase in variable input. See: law of diminishing marginal returns.
Marginal product is the extra output produced as a result of a small increase in the variable input. It is calculated as the increase in total product divided by the increase in the variable input employed, when the quantities of all other factors are constant.
The marginal product of an input is the change in output arising from using an additional unit of input.
In economics, the marginal product or marginal physical product is the extra output produced by one more unit of an input (for instance, the difference in output when a firm's labour is increased from five to six units).