The world is not too far from a unified currency.
It is still too far. Remember there are 7 continent and each continent have several countries with their own government and currency. Even with the internet and digital currency or cryptocurrency, there are still lots of variations that people use and believe in. If you are thinking that the cryptocurrency will be the one to unified all the currency, I think you are mistaken since it is decentralized, the government won't acknowledge it as their official currency. Unless there is only one government, the unified currency is next to impossible to exist.
Have always wonder which currency would the world accept if only one currency was to be used. Maybe the dollar?, don't think so, The British won't tolerate that.
Cryptocurrency?. Maybe. Until the advent of cryptocurrency, I never thought that would be possible but it seems possible.
The world is not too far from a unified currency.
It is already the Dollar and yes the British do tolerate it. Everybody price their assets in dollars. Everybody. It doesn't matter what you buy. Bitcoin, stocks, food, land, gold, beer... all of them have a dollar price tag. So the answer is pretty clear. Crypto won't be the thing because it is way too volatile. You don't want to pay a different rate every day for a can of beer.
The dollar isn't the unified currency, even the dollar itself have different
kinds of Dollar being used by different countries.