Reading the wiki entry I realised it's like in Ursula K LeGuin's "The Dispossessed" and all was clear(ish, I am still sick). Thank heavens for that book, I'd never been able to quite get my head around anarchic socialism before I read it. Still not sure it would work of course, but at least I know what people mean :)

*shakes fist at Capitalist Libertarians, boy they make me testy*