From 2000 to 2009, it was gold.If you followed it, you more than tripled your money, in terms of dollars.From 2010 to 2019…it was gold again.If you followed that, you went from $1,100 to just over $1,500, or made a 36% gain…admittedly with a ride.What is Bill’s trade of this decade?Unsurprisingly, it’s gold once more.