David Ogilvy describes this as the most useful book on advertising that he has ever read. This book teaches all of us, from novice to veteran, everything we need to know to create advertising that sells; which is the whole purpose of the industry. Whether you are in a large agency or a one person show, reading this book will give you the edge you need. Read it. Then read it again. Considering the amount of tested information between the covers, it seems to me that the price you pay is a tiny fraction of its true value.