The authors list economic concepts and issues covered in the children's books published by Theodor Geisel and discuss his treatment of concepts that appear most often and that are treated in greater depth. Some concepts are sophisticated and taught as formal concepts only in college-level economics courses. Others are basic and used in economics units for elementary classrooms. Literature searches reveal only limited coverage of the topics and works presented. The present authors show that a much wider range of material on economic concepts is available in the Seuss canon and argue that these passages offer good teaching tools for both undergraduate and precollege classes. Using books that many students read as children or that their parents read to them makes economics more memorable and accessible. (Contains 1 table and 5 notes.)