In the long run, all of a firm's costs are variable.In this case the exit criterion for a profit-maximising firm is:

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In the long run, all costs are variable, so a profit-maximizing firm will exit the market if the price it can charge for its product is less than its average total cost. This is because the firm would not be able to cover all its costs, including both fixed and variable, leading to losses.

In the Long Run, All of a Firm's Costs Are