For this unit, you should read the following two chapters. However, of these two chapters, chapter 3 in your textbook is by far more important, especially sections 3.1, 3.2, and 3.3. These merit very close attention. Chapter 4 is less important in terms of getting details. Instead, think of chapter 4 as a discussion of different situations where different examples of markets are discussed as a way to illustrate the theoretical tools & models of supply-and-demand that you read about in chapter 3.