One of the successes of the market system is that you get some amount of choice in who gets to coerce you (e.g. you can sometimes, not always, switch jobs to avoid a boss who is asking for things you don't want to do). So yes, spreading the coercive element is pretty key for that.
Importantly, "all" you need in the market system is to find _someone_ willing to pay you for doing whatever it is you would like to do for pay. I'm not going to claim that's easy (it's not), but it's a lot easier than convincing a small group of bureaucrats to pay you for that thing. This is what allows, for example, writers who cater to niche markets to exist... In theory, the central planners could be enlightened enough to fund (with food or services or whatever, if you want to assume a post-money society) that sort of thing, but in practice, why would they bother?
Rather than markets contra communism, I think we should think of it as property rights contra state ownership (of everything).
It is because people are allowed to own things that they can trade. In this system there's plurality whereas in a system where all is owned by the state, there's a monoculture.
This is why property rights are important to many things including intellectual freedom. However, the "market" can also create monoculture if one player gets too big.
Importantly, "all" you need in the market system is to find _someone_ willing to pay you for doing whatever it is you would like to do for pay. I'm not going to claim that's easy (it's not), but it's a lot easier than convincing a small group of bureaucrats to pay you for that thing. This is what allows, for example, writers who cater to niche markets to exist... In theory, the central planners could be enlightened enough to fund (with food or services or whatever, if you want to assume a post-money society) that sort of thing, but in practice, why would they bother?