So let’s consider how you would do a socialist society in terms of GURPS CRs.
First off, you can disregard all of the things that assume a market economy, or even a simple barter economy. Since taxes are normally assessed on stocks or flows of market goods, you can ignore everything about taxes. All of that language tacitly assumes that exchange, or quid pro quo, is basic.
So how does the economy work? There are at least two nonmarket models: communal and bureaucratic. In the former, decisions are made informally, on a basis of everybody knows everybody. In the latter, they’re made formally, according to rules. In principle, you could envision voting as a third organizational mode, but it’s really costly to have everybody vote on everything; you’re going to end up electing administrators to make most of the decisions, I think.
Now, let’s ignore all the economic calculation arguments about the limits of a planned economy. They’re a side issue, and we’re free to make optimistic technological assumptions, or even utopian ones. Let’s just look at how nonmarket economies might fit the different CRs.
CR0: A purely communal economy, perhaps like the Bushmen who share kills out with everyone in their band. This could be a utopian band of noble savages, or it could have everyone under the constant threat of mob violence for not sharing. There’s no separate organization that can compel people on behalf of the group—or restrain the group from compelling people.
CR1: Along similar lines, but you have some people (big men or chieftains) who take the lead in getting people to produce stuff, store it up, and then give it away, without having a monopoly of force; they can only keep their followers by being generous. A constant round of hobbit birthdays.
CR2: A formal hierarchy that ensures that common basic rules are followed and information is exchanged. Perhaps nominally anarchistic, but like the Production and Distribution Committee on Le Guin’s Anarres. Probably has law enforcement and emergency services to keep people from dying by accident or violence.
CR3: Somewhat of a Scandinavian feel, but with all production done by cooperatives, and with all goods allocated by a planning agency rather than sold or bartered.
CR4: A similar system, but with more of the Iron Law of Oligarchy in effect. The central planners have strong powers of regulation and can use them to pressure local organizations and to cover up their own self-benefiting strategies.
CR5: A collective economy with a ruling party that has lots of privileges and doesn’t tolerate dissent. Probably has a lot of corvée labor or the equivalent.
CR6: Likewise, but with active demands for displays of enthusiasm and a need for “enemies” to fear and attack. Basically a militarized society under total mobilization. It might have a king or prophet or emperor, but it may also have the state as a collective entity repressing the individuals who make up that collective entity. Kampuchea under Pol Pot could be an example.
One could also do a hierarchy of societies that are intermediate between market and nonmarket, I suppose. But this is a thought exercise in how purely nonmarket systems could range from no coercion to total coercion.