The output of rain forest people doesn't grow because their culture haven't evolved private property rules, it is no related to debt.
There are a few prerequisites needed before people can start producing economic surplus.
Tribal people in rain forests haven't yet figured out how to not routinely
murder each other, so learning how to not respect property is still a ways off.
This link does not describe pre-patriarchal, anarchist human being. It describes the life style of gated communities within a civilized environment around it. Paleolitic, pre-patriarchal, anarchist life style was completely different.
Maternal incest is what is behind the cross-cultural finding by anthropologists that where the mother sleeps closer to the baby than to the father and uses the baby as a substitute spouse, there is more homicide and a higher frequency of war.5 Crazy science. A 'spouse' and a 'father' did not exist in the paleolitic anarchist environment, because nobody knew the begetter. It seems that those psychologists know nothing about the former anarchist life. They are believers of the post-paleolitic monogamous joke, called 'life'.
And you, Justus, are promoting such 'science'? I thought at least you are an anarchist. And now you argue against those people who have not been nationalized yet, with this pseudo science of the establishment.