With the increasing popularity of Kindles, iPads, Nooks, and other e-readers, book sales have gone down since 2010.
Hardcover books were once a golden ticket, but recently, sales have gone down more than 23%.
Since the beginning of the Harry Potter craze, J.K. Rowling has always been one of the highest-earning authors in the world.
Shockingly, she didn't make this year's top ten.
While other authors have been able to stay on top by converting their books into e-books, Rowling will not be doing so until later this year, and earned much less money this past year than many other best-selling authors.
Forbes investigated and compiled a list of the world's top earning authors.
