10 Keys to Success in Selling Double and Triple Sales in Any Market. “The purpose of this book is to give you a series of ideas, methods, strategies and techniques that you can use immediately to make more sales, faster and easier than ever before”. It’s a promise of prosperity that sales guru Brian Tracy has seen fulfilled again and again. More sales people have become millionaires as a result of listening to and applying his ideas than from any other sales training process ever developed.