Bestseller charts are lists that rank and display the books or other products that are selling the most copies within a certain period of time. They show which items are popular and selling well. Full definition
Based on bestseller charts, I think it is reasonable to assume indies account for around 40 percent market share at the other major retailers too. (thebookseller.com)
A quick glance at any ebook bestseller chart shows self - publishers dominating. (goodereader.com)
The official bestseller charts try their best to ignore indie authors so let's not even go there. (dealsagar.com)