Works of art are unique in nature and difficult to value with precision. A sophisticated buyer of artworks knows that many factors contribute to value, including the artist, maker or author, their nationality, as well as the object's condition, size, origin, provenance, subject matter, material or medium, signature or maker's marks, exhibition history, publication history, origin, and date of manufacture or creation. Market forces affect the price of art as they do everything else, as does an individual person's taste, and a list of auction results is no guarantee of future prices, nor does it definitively indicate trends, selling floors or likely ceilings. Furthermore, artnet's price database only records publicized sale prices. It does not record private sales, dealer sales, museum gifts or other various types of private transactions that may affect the value of similar works of art.
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