You have my attention. My advisor wrote a book that sums up how I think about nineteenth century US political economy pretty well: a transition from freedom meaning the option to escape from the forces of markets into a society where freedom meant the ability to participate in markets. Without wishing to turn this into the CE thread (God forbid), I think we're in a moment where that formulation might still apply.
I'm not sure I would equate the old political economy as the option to escape from market forces. Perhaps you can elaborate on that. I mean, even though self sustainment and self mastery were large components of liberal thought at the time, I don't think total economic isolation was ever the ideal.
I do agree that later freedom evolved into the idea that you were free to participate in markets, though. It's also interesting to note that some early capitalist thinkers believed that this freedom didn't just mean the ability to participate in markets, but also to redefine freedom as an internal psychological system of values rather than an external one.