The article ignores agriculture and animal husbandry as the critical inflection point for property rights and mass conflict. You could argue proto-versions of these dynamics existed even in abundant hunting grounds—see Native American tribal warfare over territory. More importantly, it misses technology as a third layer. As technology deflates the base layers of Maslow’s hierarchy, inequality matters less in absolute terms. The main constraint now is housing, but even that could be solved through vertical development and better long-term urban planning. We might actually be at escape velocity to break the historical cycles described here.