This blog is designed for use in courses that focus on the economics of development in Africa, Asia, and Latin America, as well as the "transition" countries of East Europe and the former Soviet Union now classified as developing countries. It is strucured and written both for students who have had some basic training in economics and for those with little or no formal economics background. For both groups, essential principles and concepts of economics that are particularly relevant for understanding development problems are highlighted in boldface and explained at appropriate points throughout the text. They are also defined in a detailed glossary. Thus the book should be of special value in undergraduate development courses that attract students from a variety of disciplines. Yet the undergraduate and some graduate economics requirements in the field of development.