In everyday use, the term bestseller is not usually associated with a specified level of sales, and may be used very loosely indeed in publisher's publicity. Bestsellers tend not to be books considered of superior academic value or literary quality, though there are exceptions. Lists simply give the highest-selling titles in the category over the stated period. Some books have sold many more copies than contemporary "bestsellers", but over a long period of time.
Blockbusters for films and chart-toppers in recorded music are similar terms, although, in film and music, these measures generally are related to industry sales figures for attendance, requests, broadcast plays, or units sold.
Particularly in the case of novels, a large budget, and a chain of literary agents, editors, publishers, reviewers, retailers, and marketing efforts are involved in "making" bestsellers.
Tristram Shandy, a rather long novel by Laurence Sterne, became a "cult" object in England and throughout Europe, with important cultural consequences among those who could afford to purchase books during the era of its publication. The same could be said of the works of Voltaire, particularly his comedic and philosophically satirical novel, Candide, which, according to recent research, sold more than 20,000 copies in its first month alone in 1759. Likewise, fellow French Enlightenment author Rousseau, especially his Julie, ou la nouvelle Héloïse (1761), and of Johann Wolfgang von Goethe's novel, Die Leiden des jungen Werther (The Sorrows of Young Werther) (1774). As with some modern bestsellers, Werther spawned what today, would be called a spin-off industry, with items such as Werther eau de cologne and porcelain puppets depicting the main characters, being sold in large numbers.
By the time of Byron and Sir Walter Scott, effective copyright laws existed, at least in England, and many authors depended heavily on their income from their large royalties. America remained a zone of piracy until the mid-nineteenth century, a fact of which Charles Dickens and Mark Twain bitterly complained. By the middle of the 19th century, a situation akin to modern publication had emerged, where most bestsellers were written for a popular taste and are now almost entirely forgotten, with odd exceptions such as East Lynne (remembered only for the line "Gone, gone, and never called me mother!"), the wildly popular Uncle Tom's Cabin, and Sherlock Holmes.
Bestsellers also may be ranked separately for hardcover and paperback editions. Typically, a hardcover edition appears first, followed in months or years by the much less expensive paperback version. Hardcover bestseller status may hasten the paperback release of the same, or slow the release, if hardcover sales are brisk enough. Some lists even have a third category, trade paperback bestsellers.
In the United Kingdom, a hardcover book could be considered a "bestseller" with sales ranging from 4,000 to 25,000 copies per week, and in Canada, the rule of thumb is 5,000 copies per week,* although the number remains relative—a book may be considered a bestseller in relation to other books without ever reaching that threshold. There are many "bestseller lists" that display anywhere from 10 to 150 titles.
Lists from Amazon.com, the dominant on-line book retailer, are based only on sales from their own Web site, and are updated on an hourly basis. Wholesale sales figures are not factored into Amazon's calculations. Numerous Web sites offer advice for authors about a temporary method to boost their book higher on Amazon's list using carefully-timed buying campaigns that take advantage of the frequent adjustments to rankings. The brief sales spike allows authors to tout that their book was an "Amazon.com top 100 seller" in marketing materials for books that actually have relatively low sales. Eventually book buyers may begin to recognize the relative differences among lists and settle upon which lists they will consult to determine their purchases.
The weight and price of a book may affect its positioning on lists. The Amazon.com list tends to favor hardcover, more expensive books, where the shipping charge is a smaller percentage of the overall purchase price or is sometimes free, and which tend to be more deeply discounted than paperbacks. Inexpensive mass market paperbacks tend to do better on the New York Times list than on Amazon's. Book Sense and Publishers Weekly separate mass market paperbacks onto their own list.
Category structure affects the positioning of a book in other ways. A book that might be buried on the Book Sense hardcover fiction list could be positioned very well on the New York Times hardcover advice list or the Publishers Weekly religion hardcover list.
This situation suggests a similar one in the area of popular music. In 1991, Billboard magazine switched its chart data from manual reports filed by stores, to automated cash register data collected by a service called SoundScan. The conversion saw a dramatic shake-up in chart content from one week to the next.
Today, many lists come from automated sources. Booksellers may use their POS (point-of-sale) systems to report automatically to Book Sense. Wholesalers such as the giant Ingram Book Group have bestseller calculations similar to Amazon's, but they are available only to subscribing retailers. Barnes & Noble and other large retail chains collect sales data from retail outlets and their Web sites to build their own bestseller lists.
Nielsen BookScan U.S. is perhaps the most aggressive attempt to produce a completely automatic and trusted set of bestseller lists. They claim to be gathering data directly from cash registers at more than 4,500 retail locations, including independent bookstores, large chains such as Barnes & Noble, Powell's Books, and Borders, and the general retailer Costco. Unlike the consumer-oriented lists, BookScan's data is extremely detailed and quite expensive. Subscriptions to BookScan cost up to $75,000 per year, but it can provide publishers and wholesalers with an accurate picture of book sales with regional and other statistical analyses.
At least one scientific approach to creating bestsellers has been devised. In 2004, Didier Sornette, a professor of geophysics and a complex systems theorist at UCLA, using Amazon.com sales data, created a mathematical model for predicting bestseller potential based on very early sales results. This information could be used to identify a potential for bestseller status and recommend fine tuned advertising and publicity efforts accordingly.
In 1995, the authors of a book called 'The Discipline of Market Leaders' colluded to manipulate their book onto the best seller charts. The authors allegedly purchased over 10,000 copies of their own book in small and strategically placed orders at bookstores whose sales are reported to Bookscan. Because of the ancillary benefits of making the New York Times Bestseller list (speaking engagements, more book deals, and consulting) the authors felt that buying their own work was an investment that would pay for itself. The book climbed to #8 on the list where it sat for 15 weeks, also peaking at #1 on the Business Week best seller list. Since such lists hold the power of cumulative advantage chart success often begets more chart success. And although such efforts are not illegal, they are considered highly unethical by publishers.
The use of the marketing phrase, underground bestseller further illustrates the independent-from-sales, self-defining aspect of the term. For example, publisher HarperCollins suggested the bestseller potential of Divine Secrets of the Ya-Ya Sisterhood: A Novel by announcing "...four years after her award-winning, underground bestseller, Little Altars Everywhere..." in the promotion. The book went on to achieve bestseller status in the 1990s. In reviews of the 2002 film of the same name, the novel's bestseller status was cited routinely, as in "compelling adaptation of Rebecca Wells' bestseller".
The famous Diogenes Publisher at Zürich (Swiss) started to talk about its own Worstsellers in 2006, and therewith brought a new mode-word into the German speaking European countries.