“Does anybody think it’s unwise to be lean, nimble, and innovative? Who needs a book to know that rote behavior and fear of uncertainty are not going to take us very far?” It turns out, a lot of people need (or at least think they need) those books. The New Yorker’s Louis Menand on best-selling books that are all part of the life biz. (Coming soon: How to Save for Retirement By Waiting for the Paperback Edition.)