It seems you don't have to be licensed in Arizona to put steel mesh over vents to keep roof rats out. But you need a license to advertise that you put steel mesh over vents to keep roof rats out.regulation, while a useful concept in a world of cheats and greed (that is, one run by humans), needs to be thoughtfully implemented lest it reduce us to pawns and lab rats under the control of our neighbors.
if you think this is a nit of an example, you should check out some other instances of governmental denial of a right to earn a living. our national polity is reverting to oligarchy.
still think Friedman was wrong?