Cost curves and profit maximisation graph

Change the market price and fixed costs. The firm produces where marginal cost equals marginal revenue, with profit or loss shaded.

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Questions students ask

Where does a firm maximise profit?

Where marginal cost equals marginal revenue, with marginal cost rising.

When does a firm shut down in the short run?

When the price falls below the minimum average variable cost, so it cannot cover its variable costs.

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