The graph to the right illustrates an increase in fixed costs with a shift of average total cost to ATC2. This is what would occur if the firm's rent, property taxes, or annual insurance premiums rose.

    Notice that there is nothing the firm can do. The profit maximizing level of output remains unchanged. Since variable costs didn't change MC doesn't change and since demand didn't change MR doesn't change. So, when fixed costs rise the profit maximizing monopolist does not alter output or price.

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