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Unformatted text preview: clining losses). This process of entry and exit continues until the firms in the market are mak-ing exactly zero economic profit. Figure 17-2 depicts the long-run equilibrium. Once the market reaches this equilibrium, new firms have no incentive to enter, and existing firms have no incentive to exit. Notice that the demand curve in this figure just barely touches the average-total-cost curve. Mathematically, we say the two curves are tangent to each other. These two curves must be tangent once entry and exit have driven profit to zero. Because profit per unit sold is the difference between price (found on the demand curve) and average total cost, the maximum profit is zero only if these two curves touch each other without crossing....
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- Spring '10