Marina do Bairro!!

A publishing rule of thumb is that a non-fiction author will sell half as many books with each successive effort. An author’s first non-fiction book is generally the best ideas of his or her entire life. The second book is the stuff that wasn’t good enough to be in the first book. Some non-fiction writers defy the Halving Effect. And the biggest names in fiction do it routinely. When you see that happening, it often means ghost writers have taken over the heavy lifting while the famous author is more of a project manager.