A Firm Is Hiring Resources X, Y, and Z in the Profit-Maximizing

Multiple Choice

A firm is hiring resources X, Y, and Z in the profit-maximizing amounts when

A) $\text { MRP }_{x} / P_{x} \text { equals } \mathrm{MR} \mathrm{P}_{y} / P_{y} \text { equals } \mathrm{MRP}_{z} / P_{z} \text { equals } 1 \text {. }$
B) the sum of the MRPs of the three resources is at a minimum.
C) the marginal revenue productivity of all three resources is the same.
D) the marginal revenue product of the last dollar spent on each of the three resources is the same.