The Supply Side of Scaling

When musk says, i do this, i do athe. Key behind all his ideas is the supply side. Now let's go to the process in humans and inputs. So one thing i want to be clear about is i am not saying that you can't scale with humans. We've done that at uber and left. And there are lots of substitutes for people who can drive a car. That's the supply side of scaling, ok.