【单选题】If both the marginal cost and the average variable cost curves are U-shaped, which of the following is true over the range of output for which the average variable cost curve has a negative slope?
A.
The marginal cost curve must have a negative slope.
B.
The average total cost curve must have a negative slope.
C.
The marginal cost curve is below the average variable cost curve.
【单选题】If average variable cost exceeds average fixed cost at a particular level of output:
A.
Profits must be positive.
B.
That fact is meaningless for deciding the quantity of output to produce.
C.
It is more likely that the output level is low relative to the designed capacity of the production facility than that the output level is low relative to the designed capacity of the production facility.