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Relation

Relationship between Marginal Cost and Average Total Cost

The marginal cost (MC) curve has a critical relationship with the average total cost (ATC) curve. When marginal cost is below average total cost (MC < ATC), producing one more unit pulls the average down, so ATC is decreasing; when marginal cost is above average total cost (MC > ATC), ATC is increasing. Because ATC falls while MC lies below it and rises once MC exceeds it, the MC curve intersects the ATC curve at ATC's lowest point, where MC = ATC. This minimum point marks the firm's most cost-efficient (break-even) scale of output.

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Updated 2026-07-20

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