Not necessarily.... they just have to find other ways to 'trade'.... for example Carolien above effectively bartered work for food.... of course you could say they are still dependent on the broader money-system, but then again such individual life-experiments can never overcome that, that requires more co-ordination.. Elf Pavlick is much more into that than Carolien Hoogland.
P.S. I had a quick trawl through yer steem DB. Hows the self-voting experiment going? I'm constantly tempted to only self-vote, but I just have this intuition that sharing it round is going to be better for me in the long run!