Since its publication more than three decades ago, this book has been a course in many universities in Saudi Arabia and neighboring countries. The book's acceptance by economics professors and students has necessitated frequent updates to keep pace with developments in the field and its presentation media. This fifth edition, the most comprehensive, has benefited greatly from the comments and corrections of colleagues who have taught the subject over the years. This book differs from other Arabic-language courses on the subject in two ways: first, it contains real-life examples to illustrate the theoretical concepts, which are placed on its framed pages, and second, it includes exercises and questions to help students and professors.