There probably aren't too many economies that only apply to ripple without applying to other things as well. The one thing that Ripple attempts to do is create a sort of bridge between the cryptocurrency and fiat world, granted its a very tough problem to solve. A lot of industries were this is going to apply will be large banking and financial services. So perhaps you could figure out something in that niche, but that is a difficult one to enter without some capital and/or infrastructure in place. You could always attempt to innovate as well.