| http://www.w3.org/ns/prov#value | - Thus, many types of items that may intuitively be viewed as commodity-like, such as used DVDs, are not suitable for trading using CDAs, because the variations between instances render them non-identical; a buyer would not be equally satisfied with any instance of a particular movie title on DVD for the same price. (Some are in better or worse condition, in a preferred or non-preferred format, or h
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