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What makes you think that owning, maintaining and operating a fleet of self-driving cars will be that much cheaper than just hiring people who own and maintain their own cars.

We don't know the answer to that, because it would be determined by how much the public trusts technology that doesn't exist yet (at least not in a form ready to be deployed en masse by Uber). And if they did trust it, there'd be no reason for Uber to give a 75% discount for using it.

Spend some time out of a city. Or at least trying to consider what life is like outside of a city.

I grew up on a farm in the country. Perhaps you should try to consider that:

1. 80% of the US population lives in urban areas.

2. The cheaper Uber gets the farther out from population centers it can expand.