I thought Chomsky's quote was interesting. "Take the most advanced case: Mondragon. It’s worker owned, it’s not worker managed, although the management does come from the workforce often, but it’s in a market system and they still exploit workers in South America, and they do things that are harmful to the society as a whole and they have no choice. If you’re in a system where you must make profit in order to survive…
Is the alternative 100% top-down central-managed solution to ensure no externalization happens ever? In theory that's appealing (especial from the view from Chomsky's academic ivory tower), but then in practice every time it's been tried it hasn't worked well at all. Chomsky is smart, but not very useful because "In theory there's no difference between theory and practice, but in practice there is" - Yogi Berra
In that system, there are no stock holders demanding ever greater returns, those doing the work are always completely in control. They can choose to do "just enough" to live a good life. Or they can choose to focus on the more fulfilling aspects of their work, and not on the profit.
In that system, it's easier to pass regulations that prevent the worker cooperatives from externalizing, because the survival pressures aren't nearly as intense.
But it's not top-down centrally managed.