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Well, it’s unlikely the entire world will turn anarchist all at once, and the modern supply chain is global, so the anarchist community would trade for what they need from outside the community. Or they may choose to go anarcho-primitivism I guess. I think some remote indigenous tribes we have now could be considered anarcho-primitivist. The most successful anarcho-socialist community would probably be the Zapatistas.
Yeah, that’s what I mean, the workers could go in the factory, produce the goods, and sell them, if the company did not use violence. It’s not clear where the factory came from in this hypothetical. The community could’ve built it, it could have been abandoned, or the company could’ve claimed they “owned” it (which is not possible in the society, so it would be seized).