Uh, yes, they do exist. The example of human cultures that comes to mind are Melanesians which IIRC had relative abundance of natural resources. In the animal kingdom, Bonobos are probably the prime example.
And IIRC, in both cases the reaction to abundance wasn't overpopulation, but the development of a sharing trait. (Because it reduces the cost incurred by unnecessary competition)
In the case of Melanesians, they were at some point taken over by relatively resource-poor Polynesians. (Inequality will cause trouble). Bonobos escaped that problem since they have no competitors in their natural habitat, and they evolved a somewhat interesting mechanism to cope with any of the smaller conflicts that might pop up. (E.g. access to favorite food instead of just normal food). If you're not familiar with it, I recommend reading up on it :)
I would love to read a link about the Melanesians if you have one.
The only way a population doesn't expand to consume available resources is if there is something else which is controlling population growth. For many species, that would be predation. But humans are an apex species, so that's not a factor.
Disease is another possibility. The bubonic plague kept European populations below the malthusian limit for a long time in Europe. But not long enough to really have an effect on our evolved traits. Generally speaking, it's difficult for disease to be a significant problem without agriculture and the population density that it allows. But the consensus is that people who lived in agricultural societies pretty much universally had poor diets (ie, they were living at the Malthusian limit).
The other major factor that would prevent human populations from reaching the Malthusian limit is violence. But violence is usually committed for the purpose of increasing or maintaining status. Either by killing competitors within the tribe or by stealing women and resources from other tribes.
And IIRC, in both cases the reaction to abundance wasn't overpopulation, but the development of a sharing trait. (Because it reduces the cost incurred by unnecessary competition)
In the case of Melanesians, they were at some point taken over by relatively resource-poor Polynesians. (Inequality will cause trouble). Bonobos escaped that problem since they have no competitors in their natural habitat, and they evolved a somewhat interesting mechanism to cope with any of the smaller conflicts that might pop up. (E.g. access to favorite food instead of just normal food). If you're not familiar with it, I recommend reading up on it :)