A firm is hiring resources X, Y, and Z in the profit-maximizing amounts when:
A. MRP x /P x equals MRP y /Py equals MRP z /P z equals 1.
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.
Answer: A
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