Amari's profit is maximized when they produce a total of phone cases. At this quantity, the marginal cost of the final phone case they produce is , an amount than the price received for each phone case they sell. At this point, the marginal cost of producing one more phone case (the first phone case beyond the profit maximizing quantity) is , an amount than the price received for each phone case they sell. Therefore, Amari's profit-maximizing quantity occurs at the point of intersection between the curves. Because Amari is a price taker, the previous condition is equivalent to .