I think paper money was still used by each nation because people used it as exchanged of any items or good s but, when digital currency like Bitcoin were become the no. 1 currency I don't think so if paper money were still existing.
Yeah your right, I was expecting that paper money was not fade in the market, due to paper money were symbolize the different value of money from different countries. Moreover digital currency were still not know of more people.
It is reality, in real life people prefer to use real money and paper money is real.
But about digital currency, i know only few people know about it, and a huge people don't know and if they know about digital currencies than they don't know how to use it correctly.