The Importance of Currency in Global Trade

There is simply no example at any point through human history of the unit of exchange for global trade being that of anything other than the global hegemon and largest economy writ large. Until that changes, you can go around the world with one currency and you can pay with US dollars. The euro is not accepted in Latin America or in Asia the way that the dollar is. And so what I'm trying to do is give you just a very simple idea to back up Zihan's claim which is on a big international space with what you and I can see with our own eyes.