Since no purely free market system has every existed at the scale of a nation in human history and therefore no coercion free one either at what point does it b

Since no purely free market system has every existed at the scale of a nation in human history and therefore no coercion free one either at what point does it become acceptable to arrange your society around coercive arrangements. If you construe some tipping point like for example chance of existential or utilitarian failure that does justify coercion how do you differentiate between a society in which minimizing coercion is the goal and one in which whatever you construe as justifying coercion is actually the guiding principal.