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A used book is a book which has been owned before by an owner other than the publisher or retailer, usually by an individual or library. Used books typically become available on the market when they are sold or given to a second-hand or used book shop. Some new book shops also carry used books, and some used book shops also sell new books. Though the original authors or publishers will not benefit financially from the sale of a used book, it helps to keep old books in circulation. Sometimes very old, rare, antique, or simply out-of-print books can be found as used books in used book shops.