Concept

Interpretation of the Long-Run Market Supply Curve with Constant Marginal Cost

In a long-run market where firms have identical, constant marginal costs and no fixed costs, the market supply curve is a horizontal line at a price, P0, equal to the marginal cost. This flat curve cannot be interpreted as a standard supply function where quantity is a function of price. Instead, it indicates that for any price below P0, the quantity supplied is zero. Conversely, for any price above P0, the quantity supplied is undefined, or theoretically infinite, though in practice it would be limited by certain constraints.

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Updated 2025-10-06

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