If you think a country can run their economy without a central bank and the government,I think it is a mistake.We need a central authority.Some people in some countries they do not know anything about the Blockchain technology.Like those people how can they do transactions? We need to educate those people about the Blockchain technology.But it seems it not happened.We can see Some countries banned cryptocurrency and all the transactions related to it.I think crypto is not to ban it should be to develop.