trade are larger or smaller than they were in the original comic book". A trade paperback will sometimes feature additional artwork, such as alternative cover art, pinup galleries by guest artists, or additional story material that had not been released in the standard issues. A common practice is to include an art gallery featuring the artwork of the original comic book covers from which the series was compiled. Many feature introductions written by prominent figures, some from outside the world of comics—for instance, The Sandman: Worlds' End features an introduction by Stephen King, the Ultimates 2 book has an introduction by Jonathan Ross and most Hellboy trade paperbacks have included introductions by prominent authors. Trade paperbacks generally do not feature advertisements, fan mail, or special foil or embossed covers. "Back-up" stories not related to the main arc may also be omitted, and in older trade paperbacks it was common practice to omit pages from the main story related to other subplots. Readers and sales Since trade paperbacks may be less expensive and more convenient than buying the individual periodicals, readers may forgo purchasing individual issues in favor of the trade. A significant benefit of the trade paperback version is that it is often available in bookstores, from smaller booksellers to the larger suppliers, and other retailers that do not normally carry comic books. Despite the growing popularity of the trade paperback, the serialized, individual issues are still considered the primary mode of sale by comics publishers, and a poorly selling series may face cancellation irrespective of trade paperback sales. However, some series, such as Ms. Marvel and Moon Girl and Devil Dinosaur, "survive on the popularity of their trades sales, not just in the direct market and local comic shops, but in book stores across the world" and at "Scholastic [book] fairs and the like". Other times a series might be relaunched after cancellation, such as Iceman and The Unstoppable Wasp in 2018, if the series has good trade sales. In 2018, Screen Rant highlighted, "publishers and retailers traditionally ignore the sales of trade paperbacks when it comes to deciding whether or not a specific title is doing well. For decades, the single issue has been king, even though those sales figures are far from helpful. [...] Trade paperbacks are increasingly important as a marker of what sells, with 2016 seeing a 12% jump in trade sales over 2015 -