Marginal product of capital
The marginal product of capital (MPK) is the additional output resulting, ceteris paribus, from the use of an additional unit of physical capital. It equals the opposite of 1 divided by the incremental capital-output ratio. It is the partial derivative of the production function with respect to capital.
MPK is equal to the rental rate of capital.
- "Marginal product of labor and capital", Northwestern University class handout 
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