Admittedly,agriculturalpriceshaveallexternalfactors.Suchasinevitablescourgeleadtoagriculturalproduction,theso-called"contentwithrareforexpensive"rarenaturalitspriceishigh.Anothersuchaspricesgenerallyrisesplantinghighercosts,causedtheagriculturalproductalsohadtoonpricerisingovertheandsoon.However,anyproductpriceshavea"degree".Itshouldnotbetheirrationalandlimitpricesatrandom,alsoshouldnotbefarbeyondtheproductitselfcontainsthevalue,moreshouldnotseriousfromcurrentmarketdemandandpeople'sconsumptionlevel.Ifexcessivebeyond,isthe"andisnotcausedbyman-made"cutteasingofthescourge.