Best-selling author Kabir Sehgal explores the future of money during the age of space exploration. How will we pay to tour the galaxy? What form of currency will reign dominant in the year 2515? Sehgal goes on to explain why it's better to pay attention to predictions of science-fiction than those of economists. Sehgal is author of The New York Times Bestseller Coined: The Rich Life of Money and How Its History Has Shaped Us.