Final answer:
A monopolist determines its profit-maximizing level of output by finding the point where marginal revenue is equal to marginal cost.
Step-by-step explanation:
To determine the profit-maximizing level of output, a monopolist can use the points on the demand curve to calculate total revenue and then determine marginal revenue. The profit-maximizing quantity occurs where marginal revenue (MR) equals marginal cost (MC). This can be seen in graphs and tables where MR intersects with MC. For example, in Figure 9.6, MR = MC occurs at an output of 5.