succession of digital -- >> bitcoins for those of you who don't know, internet form ofq currency that been limited in order to protect you against devaluing dollar. >> very innovative. by comparison to the dollar, bitcoin makes the dollar look like a dinosaur. like there has been no improvement in our money in a very long time. it's for the digital age. more like physical property. best thing is the government is not involved with it at all. it was created by the market itself. it's a beautiful thing. the most and plausible sort of currency, if you had said ten years ago would the market create a currency that would allow me to trade with anybody in the world, even if you didn't have a credit card, would that happen? no, that wasn't happen. but it did happen. >> on that't note, thank you, jeffrey and ben.ng coming up, roman emperors spent