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The final stage in publication is making the product available to the public, usually by offering it for sale. In previous centuries, an author was frequently also his own editor, printer, and bookseller, but these functions are usually separated now. Once a book, newspaper, or other publication is printed, the publisher may use a variety of channels to distribute it. Books are most commonly sold through booksellers and other retailers. Newspapers and magazines are typically sold directly by the publisher to subscribers, and then distributed either through the postal system or by newspaper carriers. Periodicals are also frequently sold through newsagents and vending machines.