| http://www.w3.org/ns/prov#value | - The retailer receives a payment, which may or may not be based on the amount paid by the buyer, from a party other than the buyer, such as the purchasing system or product manufacturer, in exchange for providing the product to the buyer. [0337] In another embodiment of the present invention, the purchasing system device 2900 communicates with the buyer device 2800 to establish a first price for a
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