The third world countries such us kyrksitan is that the currencies has no value.
So You Can't Even Exchange them to other currencies... What They do about it?
Its Not spoken problem much but its a problem
If it doesn't have any purchasing power then it is not really a currency.But is it possible for a currency value reaches zero? There are currencies got extreme low purchasing power but still they got some value and government is not going to use bitcoin as their main currency if that is the case.