It may be hard to remember, but not too long ago, hailing a taxi in many cities was often a hassle. Ever since companies like Uber and Lyft entered the world, it's become a lot easier for consumers to catch a ride -- and a lot tougher for drivers to make a living. Henry Farber, a Princeton University economist, joins Scott Lanman of Bloomberg News and Daniel Moss of Bloomberg View to explain the dynamics of this industry -- and how it may be upended once again by driverless cars.