Bitcoin’s price soared to more than $15,000 last week. And as of yesterday afternoon, investors can trade bitcoin futures on a major public market — the Chicago Board Options Exchange. What’s behind the cryptocurrency’s incredible rise? And what will happen when it falls? Marketplace Tech host Molly Wood talks with Kevin Werbach, a professor at the University of Pennsylvania’s Wharton School about the sensational rise of bitcoin and what could happen when the bubble bursts.