Final answer:
The sales figures for John Grisham's most recent novel are not specifically given, but based on the publishing industry's norms, popular authors like Grisham can have significant sales. Edition releases and ISBN tracking can also provide indicators of sales volume for his novels. As a well-known author, Grisham's books are likely to sell well across various editions and formats.
Step-by-step explanation:
The number of copies sold of John Grisham's most recent novel can be understood within the context of the publishing business and book sales statistics. Considering the publishing industry trends, it's prominent that authors with a strong reputation, like John Grisham, tend to have successful sales figures. From the information provided, it's known that many books do not earn back the advances paid to authors. However, famous authors have the potential to command multimillion-dollar advances indicating a high level of sales is expected to offset such advances.
Regarding Grisham's novel, no specific sales figures are provided, but the context suggests that a successful novel could reach sizable figures, especially if released in multiple editions, similar to the 1936 book example provided that reached a circulation of 250,000 by its third edition. Moreover, as John Grisham is a well-established author, his novels are likely to be anticipated and purchased by a wide reading audience, increasing the potential sales numbers.
Lastly, understanding the ISBN system might give clues about the book editions and help in tracking their sales. Each format, be it hardcover, paperback, or digital, has a unique ISBN which facilitates the collection of sales data by publishers and other entities such as bestseller lists.