THERE HAS NEVER BEEN A FREE MARKET
Libertarians use false logic in most of their arguments, including the trade between equals partners in the market place. There never has been, nor will ever be, because of one big thing they never consider or admit, human behavior and greed.
A well regulated market provides a free society. The way to beat a school yard bully, abusive partners, criminals, and other bad actors is through societal institutions and community. Similarly, the one percent operates one selfish principles and their behavior must be regulated.
Another example is that all engines, like your cars, have a governing system that requires materials and energy, usually called the governor. Though it takes resources to have one without it your engine would spin out of control and self destruct. Similarly, we need a regulated market.