https://old.reddit.com/r/AnCapCopyPasta/comments/lxu2gm/even_if_real_communism_were_possible_it_would/
This subreddit is hilariously bad. One important takeaway is that calling them "anarcho"-capitalists really fucking bothers them, so definitely keep doing that. Another one is that I noticed that I have the subreddit's founder tagged as a /r/c**ntown user, and apparently they were banned at some point. I have to wonder why.
I'd have to brush off my copy of Debt: The First 5000 Years, but as I recall a lot of it focused on evidence that pre-capitalist exchange usually did not give rise to a currency economy.