I prefer multiple systems of scale based on mutual aid, where all shared institutions and resources are collectively owned and managed by the people working in those institutions without the obligation of profit. Then those institutions would cooperate to form larger scale systems that can form the complex widespread support for our technologically advanced society without having to be centrally managed or owned. Necessarily, but not ideally, there would be a limited free market that is completely isolated from the actual organizational structure (no lobbying, no private ownership of necessities, etc.) to allow interaction with non-collectivist states and entities.