"This book takes the economic body apart and describes the parts in relation to the whole. Its purpose is to enable the average person to avoid behavior injurious to the nation's economic health...It is just a simple explanation of the mechanical operation of the economic body exactly as one would explain a motor car by relating the operations of" [each main component, its relation to the whole, and how they function together]. As of May, 1960, "Over one million copies of this book have already been sold!" and has become "the most widely read economic primer of all time," used in 26 foreign nations.