On: Uber’s First Self-Driving Fleet Arrives in Pittsbu...

[soundwave106]

Right, but the robots displace jobs to the point where only 1/4 of the amount of people can actually afford to buy your widget, your profit will fall.

(Obviously, if jobs merely shift, as has happened in previous technological disruptions, this scenario isn't a problem.)

[euyyn → soundwave106]

Usually there's much much more people buying any given thing than people producing it.