Anarchism is how people operate in 99% of their interactions, everywhere except where the state pushes up against them. It absolutely works, and is exactly what got humans to the point where the state could even come into existence.
Human nature is not a valid argument, since we don't actually know what it is. Until you can show me a human who was not born into a statist, competitive, trauma-based society, we have no idea what our nature is, only what the environment is creating.
And BDW ;) If you’re ordering other people to not trade openly and freely however they choose to do that as long as nobody is hurt or defrauded...... you’re not any kind of anarchist. Just an asshole statist who has no basics of economics