well free markets meant something very different in adam smith's time; what they meant by free was 'free from rents' whereas today its usually mean in the milton freedman terms as 'free from any interference' which is how i interpret the parent poster...
H: Milton Friedman.
D: Why are they all called Milton? Anyway, I've only got as far as Milton Keynes.
H: Maynard Keynes.
D: I'm sure there's a Milton Keynes.
H: Yes, there is, but it's... [appears quite miffed]
https://www.youtube.com/watch?v=KgUemV4brDU