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Suppose a monopolist faces two independent markets. In the first market, demand is , and in the second market, demand is . The monopolist solves the typical problem of setting the price (in conjunction with volume of production) so as to maximize total profit collected from both markets. For whatever reason (legal, technological, marketing, etc.), she is nondiscriminating, which means she sets the unified price for both markets. As you can see, the monopolist deals with a total demand curve that is piecewise due to the "horizontal summation" of two linear demand curves, because the dependent variable is plotted along the horizontal axis. It is also instructive to study the total marginal revenue curve that is discontinuous in the case of a broken total demand curve (use hide/show checkboxes to see how to get it). Such behavior of total marginal revenue poses a problem: how to define the optimal price if we have two pieces of that could be equated with a single cost curve. To resolve this problem, we find the indifference level of costs. If the marginal cost curve lies below that level, we use the right piece of , and the left piece otherwise. To ease profit calculation, the monopolist's production technology is characterized by constant marginal costs (the red curve is given and can be controlled). All optimal solutions (total profit, price, and quantity) are calculated dynamically on the control panel. Click the "Set price" button to show the optimal price level.