Final answer:
A monopolist should decrease its output until marginal revenue equals marginal cost in order to increase profit.
Step-by-step explanation:
A monopolist can determine its profit-maximizing level of output by analyzing the marginal revenue and marginal cost. If the monopolist is producing at a point where marginal cost exceeds marginal revenue, it should reduce its output until marginal revenue equals marginal cost, or MR = MC. This quantity can be easily identified graphically by finding the point where the marginal revenue and marginal cost curves intersect.