In this unit, students should be able to describe the similarities and differences between market structures. To help students develop this skill, consider first approaching the topic by using real-world examples and having students describe distinguishing characteristics of those examples. Using graphic organizers such as Venn diagrams might also be helpful to keep track of similarities and differences. Graphing continues to be essential in this unit, and graphing each market structure can be difficult for some students. Be deliberate in modeling the differences between a license/patent monopoly and a natural monopoly, as well as a monopolistically competitive firm both in the short-run (with profits or losses) and at long-run equilibrium. While it is critical that students understand the differences between the graphs in each of these models, it is also important to stress the similarities. For example, a common characteristic of all imperfect product market graphs is that the marginal revenue curve lies below the demand curve. Regardless of the market structure, students should practice neatly drawing each graph and labeling it appropriately until they can do so flawlessly.