The Internet of bricks

But a self-driving taxi fleet does offer so many opportunities for parents! Do you have any idea how expensive it is to buy a push-chair, then sell it and buy a two-seater pushchair when you have a second child. Buy a bigger car, then buy another one when your child takes up skiing or playing the double-bass. Plus the hassle of baby chairs as pointed out above.

Not having to own any of this stuff would save so much money. Need a car with three baby chairs? Call one out, just for you. It'll be more expensive than using a bus, but much less than owning exactly the right type of vehicle for epsilon years and then selling it at a loss.

Big companies can afford to own one of every esoteric type of car due to economies of scale. When you stop needing it, the next parent/kayaker/big-game hunter/regular commuter/whatever can use it.