I think you could go through the Forbes 100 list and ask "where did that money originally come from?"
You'll find a lot of variance, but most of them boil down to: provided a good or service that people were willing to pay money for (meaning they preferred the good or service more than the money it cost them).
You'll find a lot of variance, but most of them boil down to: provided a good or service that people were willing to pay money for (meaning they preferred the good or service more than the money it cost them).