8q2 If the total-cost function for a manufacturer is given by c= 9+2 +6000, find the marginal-cost function. Select the correct choice below and fill in the answer box to complete your choice. OA. The marginal-cost function is dq dc dc OB. The marginal-cost function is dq

Average cost curves (except for avenge fixed cost) tend to be U-shaped, decreasing and then increasing. Marginal cost curves have the same shape, though this may be harder to see since most of the marginal cost curve is increasing. Why do you think that average and marginal cost curves have the same general shape?