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Marginal Product




:marginal product of X used in producing '''Y''' = Δ'''Y'''/ΔX = (the change of '''Y''')/(the change of X).

In Neoclassical Economics , this is the mathematical Derivative of the Production Function . Note that the "product" (Y) is typically defined ignoring External Costs And Benefits . In the "law" of Diminishing Marginal Returns , the marginal product of one input is assumed to fall as long as some other input to production does not change.

In the neoclassical theory of the Competitive Markets , the marginal product of labor equals the Real Wage . Similarly, under the same conditions, the marginal product of Capital equals its Rate Of Return . But there have been severe Criticisms of this theory.