A vanity press, vanity publisher, or subsidy publisher is a term describing a publishing house in which authors pay to have their books published. Additionally, vanity publishers have no selection criteria as opposed to other "hybrid" publishing models. The term appears in mainstream U.S. publications as early as 1941. In contrast, mainstream publishers, whether major companies or small presses, derive their profit from sales of the book to the general public. Publishers must therefore be cautious and deliberate in choosing to publish works that will sell, particularly as they must recoup their investment in the book (such as an advance payment and royalties to the author, editorial guidance, promotion, marketing, or advertising). In order to sell books, commercial publishers may also be selective in order to cultivate a reputation for high-quality work, or to specialize in a particular genre.