If it's just the bare minimum to survive (e.g. food + roof), there's still quite a lot of self-interested incentive to pull your weight. Of course, some people

If it's just the bare minimum to survive (e.g. food + roof), there's still quite a lot of self-interested incentive to pull your weight. Of course, some people would be satisfied with the bare minimum but my guess is it wouldn't be a large percentage of the population.