If everyone has their own currency then it will be very bad with the economy of a country even very bad for the world economy because people are shopping or doing transactions with their own currency so that currency is no longer valuable because there are too many currencies circulating in a country.
Very bad for the economy ? Are you seriously kidding ? First and foremost, in reality, this is even a dumb and insane thing to think that everyone having their own cryptocurrency will work as it would be completely useless and unless the person just want to keep spending his own coin by himself or just bag holding it, then there is no way it would be realistic for spending on a daily basis. The way some of you think though can be crazily funny.