[peripitea]

In my experience, the rare quality is not the ability to do these estimates, but the ability to recognize situations where such estimates might be valuable. Most educated people can come up with reasonable estimates if posed the question, but far fewer realize when the question is worth posing.

Imagine a world where car2go does not exist yet. I would expect most of my friends to be able to roughly answer the question: "how many cars do you need to start car2go in City x?", but only a handful, if any, would have the imagination/insight to realize the potential and ask that question in the first place.