This is similar to thinking about anarchy. Anarchy means no rulers. No third party above the two+ parties in an interaction. Most of our interactions have no third party yet we seem to be programmed to believe anarchy will not work. Maybe I'm missing your point but I think it would be harder to come up with a non-decentralized structure in nature. It is complete anarchy with no central authority. You might have small parts like a wolf pack or ant colony that have centralized control but really... you can make a point that the "leader" is replaceable and just filling a function until their utility is gone. The system as a whole is decentralized.
Indeed, despite every attempt governments have made, the free market still rules. It might be underground like drugs, it might use an abstract currency like food stamps (traded at or near parity for cash in inner cities) or cigarettes in prison. Its like water, it will fill every crevice in the cracked foundation of central planning, where you could name some of the centralized systems that run the show like the federal reserve system or the IRS, under the skin you have everyone actong in their own self interest to get over.
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