If successive unit of labour are added to a piece of land while capital and technology remains constant, a point will be reached in the level of production when each additional unit of labour will add less to the output than previous units. This concept is known as
-
A.
productivity of labour -
B.
law of diminishing marginal utility -
C.
law of diminishing returns -
D.
law of diminishing returns of a variable factor -
E.
internal economies of sales