Comment by crazygringo

The price depends on a lot of factors. And there are many factors that can turn it into a large discount. And the larger the fleet is, the less difficult it becomes.

Of course it's less attractive at the same price, but if it's cheaper enough it becomes more attractive for the average rider. And we can even imagine cities implementing single rider surcharges at rush hour to keep traffic running smoothly.

Rush hour will be a bottleneck. So something has to be done, and it will involve trading off price and convenience. Whether it's carpool mode or self-driving buses or likely a combination of the two.