A computer company produces hardware and software using the same plant and labor. The total cost of

Question:

A computer company produces hardware and software using the same plant and labor. The total cost of producing computer processing units H and software programs S is given by
TC = aH + bS - cHS
where a, b, and c are positive. Is this total cost function consistent with the presence of economies or diseconomies of scale? With economies or diseconomies of scope?