With self-driving cars, the "driver" won't be quite free. At this point I'm not sure we actually know what the cost of the "driver" of a self-driving car will be. By this I mean, the cost of development, licensing, insuring a self-driving car, and the costs of updating maps, keeping the car on-line, and managing a fleet of self-driving cars.

It may end up being less than a human, but do we actually know that? I'm not sure we do.