Dr. Marc Faber addresses this question head on . <One is seignorage, that is, the "right" to print money that everyone will accept as having real value.> It is the same thing the Romans had and it led to severe inflation.
He actually states that this "seignorage" is a trap.
He states the world only has 4 basic currencies the Yen , the Euro, the U.S. dollar and gold.
The world is not braindead, they will see that the U.S. dollar with excessive printing had become naught but monoply money.
And regards Empire, the hard core objectivist, Warren Buffet says, face the facts, a large segment of the world hate us and it isn't gone fade away.The pressure from hostile elements will be a constant.
Faber points out that from the brief timezone of the EmperorAugustus PaxRomana, the actual life style of the Romans at home, started to deteriorate.
He also states to maintain Empire requires a constant greenback massaging of other countries otherwise their goes an alliance.And so on. We could get to NYT length on this one. So no more for now. And i am also done for now. later. max