The division of labor and specialization explain Question content area bottom Part 1 A. why, when the marginal product of labor increases, so does the average product of labor. B. why firms may find it profitable to use more workers when the marginal product of labor is negative. C. why the average product of labor falls when firms use more capital or change the layout of their businesses. D. why the marginal product of labor rises as a firm hires its first units of labor