Concept

The Profit-Balancing Trade-off on an Isoprofit Curve

To remain on the same isoprofit curve while increasing output by one unit, a firm's total profit must remain unchanged. This is achieved through a trade-off: the additional profit gained from selling the new unit must be perfectly offset by the total loss in revenue from the required price reduction on all pre-existing units. The profit on the additional unit is calculated as its price minus the marginal cost (P - c), and this amount must equal the cumulative revenue lost on the original quantity sold.

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Updated 2026-05-02

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