Example

Graphical and Financial Impact of a $1,000 Fixed Cost Increase for Beautiful Cars

If the fixed costs (F) for Beautiful Cars were to increase by $1,000 while its marginal cost (c) remains unchanged, the total profit for any given price (P) and quantity (Q) combination would decrease by exactly $1,000. This is evident from the profit formula, profit=(Pc)QF\text{profit} = (P - c)Q - F. While the absolute profit level drops, the relative profitability between any two (P, Q) options is preserved. Graphically, this means the isoprofit curves do not shift their position on the price-quantity diagram. Instead, each curve is simply relabeled to represent a profit level that is $1,000 lower than before. Consequently, the firm's profit-maximizing choice of price and quantity remains unchanged, although the maximum profit itself is reduced.

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Updated 2026-05-02

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