What??? How in any way in a Centrally planned market a "free market exchange"?
Nothing in ACA is a free market, NOTHING. and NOTHING in ACA had a goal or desire to create a free market exchange, it was expressly anti-free market with the goal to be one step closer to Single Payer
>How are you going to get everyone to agree on the same way of informing a price?
I am not sure you understand what a free market is, or would look like if your are asking this question.
It's based on models by the Hudson Institute and the Heritage Foundation, free-market think tanks and is partially based on the Republican Massachusetts plan from 2006.
The inability of republicans to replace the plan over the past decade is because the plan as it stands was more or less the Free Market proposed alternative to a European style system by their leading advocacy groups circa 2009.
The Republicans are disowning the plan now because of optics. The Heritage foundation pulled their original document for instance, but you can find it in places like here https://www.scribd.com/doc/86911670/1989-Assuring-Affordable...
Systems that have tried to work toward it are extremely centrally planned and heavily regulated such as the NYSE.
Retail plans to have a free market exchange, say of healthcare providers, say, in the affordable care act, also have lots of central planning and government regulation.
The efforts to get to a free market have been some of the most complexly planned and regulated government systems ever created.
It's necessary to try to secure the required guarantees. How are you going to get everyone to agree on the same way of informing a price? How are you going to get equal access to all options? How are you going to get a friction free transfer? Make sure firms stay competing and not carteling, collaborating, or colluding etc ... the answer is government government government. These things don't happen on their own.