| http://www.w3.org/ns/prov#value | - We chose this approach becauseproducer prices vary with many factors such as crop manage-ment, climate, varieties and market in such a way that aregional approach should provide more accurate price esti-matesthanaworldwideapproach.Tofitcomplexgeographicalpatternsas well as to be able to concentrate on largeproducingregionswithouthavingtogotothelevelofindividualcountriesforwhich manypricedata are n
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