I read the book "The Number". The author, a former editor, had the best word usage of any writer I've read. First he wastes a 100 pages telling you how few people know their Number. Eventually he defines the Number then goes on and on telling you that the Number doesn't matter. Finally you learn that what matters is having a fulfilling life. Throughout the book you learn how this very sophisticated New Yorker grew too old for Esquire, then moved to the wilderness of Wisconsin to redesign the Land's End catalog. He constantly tells about interacting with truly wealthy people and how large their Numbers are. Although the writing is so smooth, the book is not about the Number, it is about the author writing a book named The Number. Don't waste your time reading it.
Joe