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If Average Total Cost is declining, then:
Correct Answer: B — The Marginal Cost is less than Average Cost
Explanation:
Correct Answer: B
When Average Total Cost (ATC) is declining, it means that each additional unit is being produced at a lower average cost. This happens when the Marginal Cost (MC) is less than the Average Total Cost. The marginal unit is pulling the average down. Conversely, when MC is greater than ATC, the average rises. This is a standard result from the relationship between marginal and average values in economics.