I don't think that apart from bitcoin and other cryptocurrency can aid the economy of any country. Moreover, it is the government of a country that can help its economy to grow. If the developed country economy is not richm there is nothing bitcoin can do to the economy. Bitcoin can help individuals in various aspects, like trading, investing, mining. It is only a country that has legalize bitcoin that the government can task all bitcoin related field. Investors prefer to hold bitcoin because it is gives them the confidence that they will make profit, and their funds wouldn't depreciate, and this is the major reason why I will advice more people to adopt bitcoin, when I am explaining to then.