I'd be interested to ask Mark about the tier between "brick and mortar" and "digital." Sometimes even engineers get sick and need a doctor. Or sue each other and need lawyers. Or remodel their home and need a contractor. It's nice when these people are smart, and fortunately many are, even if they never write code. It's still ridiculously hard to get into medical school--our doctors are the kids who got straight As in university. Perhaps that's an extreme example, but there are many industries that do not have "the intelligence sucked out" in a human asset notion, though perhaps in another 10 years big data will write prescriptions.