The third edition of Essentials of Economics continues to cover the basic principles of modern micro and mscro economics. If students aret learn both micro and macro economicsin one course, it is better to learn the essentials well than to be overwhelmed by an excessive amount of over-specialized materials. This book is designed for a one-semester course, but is can be used in two-semester micro-macro sequences in combination with assigned readings. The third edition, however has been streamlined to give students the core essential topics. to that end, we removed four extraneous chapters.