There's no global reference frame for distance or wealth. You can't point to a spot in space and say "the Earth was here 1000 years ago". All you can say is that A is x meters from B, right now. And likewise you can't compare wealth now with wealth 50 years ago - it's not a coherent concept, when you could buy a house on a blue collar wage, but not a smartphone at any price. What you can do is say that person A is twice as wealthy as person B.