If the marginal cost (mc) curve is rising and is above the average fixed cost (afc) curve, then the average fixed curve will decline, although the marginal cost curve has nothing to do with this.
The average fixed costs or AFC curve is always downward sloping because of the reason that fixed costs are distributed over a greater volume when the quantity which is produced increases.
AFC is always equal to the vertical difference between ATC and AVC. Why the other cost curves are U-shaped is explained by variable cost to returns.
The marginal cost (MC) curve is explained as the change in total cost divided by the change in the output. Under perfectly competitive markets, the MC curve is the same as the supply curve of any firm.
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