Will the Dollar Remain King in a Cashless Society?

The dollar has been the world's reserve currency for decades, but it's history goes back centuries to before the United States was  the United States. Brendan Greeley, author of the new book "The Almighty Dollar: 500 Years of the World's Most Powerful Money," joined David Gura and Christina Ruffini on Bloomberg This Weekend to discuss the currency's history, explain its dominance in global finance, and look ahead to the role it'll play in a world in which cash is no longer king.