[morgante]

Capital sitting idly in driveways is inherently inefficient. How is that hard to understand?

> People tend to underestimate the true ownership cost of their cars, and Uber uses that to make them believe they're making a lot more per hour than they actually are.

That isn't an argument about its efficiency though.

Maybe the marginal value of a car self-driving itself somewhere is $1 and the marginal cost of that driving is $0.99—it's still more efficient for that car to drive than not. Whether the owner thinks their profit is $1 or 1 cent doesn't really matter.