[carlosrt]

He might be implying that the cost to rent a car, for 30 minutes, twice a day, would be cheaper than owning an, idle, car 24 hours a day.

Or, sharing the ride with three other commuters could bring the total cost of ownership to ~15 minutes per day.

[jey]

I meant that the incremental cost of paying a human driver would be gone. The fixed cost of inventing and developing the self-driving technology would be minimal because it is amortized across all self-driving cars.