This clearly written guide to basic micro- and macro-economic principles presents its material in the traditional programmed learning style of the STG series. The book may serve as the main text for a review of basic economics or as a supplement to first-year economcis courses. It provides a useful review of the mathematics and graphic analysis needed for economic problem solving. Exercises throughout each chapter test the reader on the material as it is presented, and a final self-test at the end of the text sums up the material covered.