Since the end of WW2, the US dollar has been the reserve currency of world trade, but recent events have brought that into question. In the short-term this may continue, but what about the future?
Way back during WW2 Keynes suggested a neutral "currency" called the Bancor that clearing banks only could use in world trade.
BRICS countries have suggested something else in place of the US dollar.
I do not know the future, but it seems clear the USA under President Trump is moving away from world trade, so the US dollar no longer makes sense as the world's reserve currency. Also, if the US dollar loses value what then?
Maybe it is time to reconsider the Bancor?
