A publisher’s mark, often a line or dot made with a felt-tip pen or marker, applied to the edge of a book to indicate that it has been sold to a bookseller as a “remainder.” This practice occurs when a title hasn’t sold as well as expected through normal retail channels. These books are then offered at a significantly reduced price.
The practice allows publishers to recoup some of their investment in unsold stock. While it can result in a good deal for consumers, collectors may view copies bearing the mark as less desirable than those in pristine condition. The origin of this practice lies in the economic realities of the publishing industry, enabling a publisher to clear warehouse space and reduce inventory costs.