Or native american tribes, other pre-industrial subsistence economies. Slavery isn't at all required. A post-scarcity star trek kind of society wouldn't qualify

Or native american tribes, other pre-industrial subsistence economies. Slavery isn't at all required. A post-scarcity star trek kind of society wouldn't qualify as consumerist. A modern commune, whether you think it's a good idea or not, and whether you think they 'work' in practice or not, absolutely could exist without consumerism and without slavery. It's silly to think what we've got going is the only way to live. Even within our system, not everyone lives a consumerist lifestyle, some are ascetic.