Description:With Freakonomics, Steven Levitt and Stephen Dubner revealed the good, bad, ugly and super freaky of the world around us. The freakquel is here. Back with more than pop-culture trivia, Inforum's next 21st Century Visionary Award recipients are ready to revolutionize our understanding of causality in an incredibly interconnected world. In this video they explain whether there is value added by selling a piece of property through a realtor or not. (3:39)