"Print on demand" technologies, which make it feasible to print as number of as 1 book at a time, have created self-publishing (and vanity publishing) a lot easier and more affordable, and it has allowed publishers to keep lower-selling books in print relatively than declaring them out of print. https://top-10-books-to-read23333.tribunablog.com/about-barnes-and-noble-talent-gateway-52326929