Think long and hard about this! Digital Currency only, a cashless society.   Not only will every transaction you make be known, scrutinized and tracked – but every transaction will also be able to be taxed and ‘they’ will be able to add and/or subtract from your funds as they see fit (depending on your behaviour) – and program what YOUR funds can and cannot be spent on! (This system is already functioning well in Communist China – total State control, no less).