The Amazon list (20 top items binned across hardcovers, paperbacks and audiobooks, which is correct if your goal is to identify a "zeitgeist trend") and the Spi

The Amazon list (20 top items binned across hardcovers, paperbacks and audiobooks, which is correct if your goal is to identify a "zeitgeist trend") and the Spiegel lists (for an unknown reason, separate lists for paperback, hardcover and "Taschenbuch", 60 items in 3 lists [1]) have 11 books in common right now. However if I only look at a single Spiegel list of 20 items, e.g. hardcovers there are only two items left in common. I think you will agree that a book sales data analysis that has not made a successful effort to include one of the biggest book sellers in Germany for years can still safely be called garbage. It is baffling for me how much reputation the Spiegel lists still have. Also, the hardcover Spiegel list has entries like the new book by Spiegel journalist Todenhöfer on rank 10 (rank 2129 on Amazon Germany right now). [1] I ignored the Spiegel audiobooks list because this data is irrelevant without Audible.