Why is the marginal product of labor likely to increase initially in the short run as more of the variable input is​ hired?A.Initially workers are able to​ specialize, but after a certain number of workers have been​ added, gains from specialization will be exhausted and diminishing marginal returns will set in.B.Initially firms are able to add additional capital for each worker hired.​ However, after a certain​ point, it becomes cost prohibitive to do so.C.Initially workers are able to​ specialize, but after a certain number of workers have been​ added, gains from specialization will be exhausted and diminishing total returns will set in.D.The marginal product always increases as more labor is hired.

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