| http://www.w3.org/ns/prov#value | - The farmer needs to know the price of fertilizer, not how it is made, or what it could be used for other than tomatoes, or the other uses of the fertilizers??? ingredients. (I do not even need to know the price of fertilizer.) The information that we need, to decide whether to buy tomatoes or to buy fertilizer, is conveyed through prices, which may go up or down, depending on the aggregate action
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