As a firm buys more capital and less labor, the marginal physical product of capital and the marginal physical product of labor , assuming the law of diminishing marginal returns has set in for each factor.

As a firm buys more capital and less labor, the marginal physical product of capital ___decreases and the marginal physical product of labor ___increases, assuming the law of diminishing marginal returns has set in for each factor.

Explanation:

In Economics, the law of diminishing returns states that when one production input is increased while the other input is held constant, the marginal production per the increasing input will decrease relatively to the marginal production of the fixed input.

Effectively, this economic law recognizes that increasing one input while allowing the other inputs to be constant will produce diminishing increase in total output.  This law is also called the principle of diminishing marginal productivity.  It is very helpful in decision making to enable management balance production inputs in order to achieve maximum outcomes.

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