the poor economies in the world have poor investors where they are not able even to afford a living and can`t think about the next month plan financially, so it is not surprising that good economies are the most users.
Countries with good economies will naturally have more opportunities than other countries. The more opportunities you have, the more revenue your economy has. They are economically viable and can even think of other ways such as electronic money. The difficult countries they are finishing, then catch up with developed countries. Because of poverty and vices.