When average cost is falling, marginal cost curve:
A
Is parallel to the average cost curve
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B
Coincides with average cost curve
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C
Is below the average cost curve
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D
Lies above the average cost curve
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Solution
The correct option is D Is below the average cost curve When the marginal cost is less than average cost, average cost falls with an increase in output. Thus as long as the MC curve lies below the ATC curve, the ATC curve will slope downwards.