From Nielson Bookscan -- Post # 7

From Nielsen Bookscan

Of the 1.2 million NEW books, 950,000 sold fewer than 99 copies. Another 200,000 sold fewer than 1,000 copies. Only 25,000 books sold more than 5,000 copies. Fewer than 500 sold more than 100,000 copies. Only 10 books sold more than a million copies each.

THE AVERAGE BOOK IN THE UNITED STATES SELLS ABOUT 500 COPIES.