Thebestexampleofsomethingisoftencalledthe"goldstandard....
問題詳情：Thebestexampleofsomethingisoftencalledthe"goldstandard."Itsetsthestandardagainstwhichotherthingsaremeasured.Ineconomics,thetermdescribeshowmajortradingnationsonceusedgoldtosetcurrencyvaluesa...