Each introductory textbook has its own particular order and distribution of emphasis. I have thought it important that the reader should first understand what is meant by the efficient use of resources for society as a whole. The f i s t part of the book is therefore concerned with the logic of choice, or of 'economizing', in this context. Only after learning what is meant by economic efficiency, and how to recognize it, can one appreciate the purpose of economic organization, and only then can one begin to comprehend and compare the alternative forms of economic organization for which central planning or competitive private enterprise provides the basis.