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Which of the following curves is not U shaped?

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Which of the following curves is not U shaped?

A.

Marginal cost curve

B.

Average fixed cost curve

C.

Average total cost curve

D.

Average variable cost

Correct answer is B

The average fixed costs AFC curve is downward sloping because fixed costs are distributed over a larger volume when the quantity produced increases. AFC is equal to the vertical difference between ATC and AVC. Variable returns to scale explains why the other cost curves are U-shaped.