To gain an edge, this is what you need to know today.Gold TariffsPlease click here for an enlarged chart of gold futures (GC_F)Note the following:The chart shows aggressive buying in gold.Aggressive buying in gold has been triggered by several factors:Concern about tariffs on one kilo gold bars.  Expectations have been for no tariffs on gold.Switzerland is a major gold refining hub.  The President of Switzerland returned from visiting the U.S. without a change in the 39% tariffs.  It is not clear how tariff ...