I am sorry, I have not.
It's just an opinion, probably based on considerations like: when the
resources are very short, the "best" way to increase them is steal
them by an act of violence, not by producing or trading or persuasion
(which are slower and more difficult ways).
Something like KoDP: cattle raid is more swift and less expensive
than cattle raising.
When resources get more abundant, trading is easier and agreement
tends to substitute violence.
Just an opinion, as I said. And a debatable one, of course.
Ciao
Gian
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