37) In a perfectly competitive labor market, the least-cost combination rule for resource use
A) requires that resources be used in combinations such that marginal products are equal.
B) requires that the marginal physical product per dollar spent for each resource is equalized.
C) assures the firm an economic profit.
D) assures the firm a normal profit.
38) In the employment of any resource, a firm should
A) equate marginal revenue product with the cost of the additional resource.
B) hire each input unit that adds more to revenue than it adds to costs.
C) hire each input unit provided its marginal physical product is greater than zero.
D) A and B are both correct.
39) Assume that a perfectly competitive firm faces a fixed wage rate of $4 and a constant per-
unit cost of capital of $2. If the marginal product of labor and capital are 16 and 6, respectively,
then to maximize profits the firm should
A) use relatively more capital.
B) use relatively less capital.
C) increase all inputs proportionately.
D) decrease all inputs proportionately.