Index : p. 501 - 509 ; There are two major parts of the book that you should be aware of before you start to read and study. First, there is the main content of the book. This make up 80 percent of the book. It consists of most of the words and diagrams in each chapter. Second, there are various boxed and stand-alone features in each chapter – such as 24/7, thinking like an economist, office hours, and finding economics.