Let’s start with scarcity.
When resources are abundant and accessible, individuals and small groups can meet their needs independently…there’s little to no incentive for hierarchy or some kind of enforced coordination. Scarcity (whether it’s real or engineered) creates conditions where access might need to be regulated. Control systems (chiefs, priests, bureaucrats) emerge to decide who gets what, when, and how. This doesn’t just apply to food…think of land, water, labor, and information. The more scarce these things are, the more power seems to concentrate in the people who manage distribution.
As populations grow and density increases, resource demand outpaces availability in a given area. This creates a new kind of scarcity, call it structural scarcity…resources aren’t always “gone,” they might just be stretched or hoarded. Anthropologists (James C. Scott, Mark Nathan Cohen) argue that the rise of agriculture wasn’t a leap forward. It was a trap…higher population density leads to soil depletion, which leads to periodic famine, which leads to tighter and tighter social controls. Scarcity and density rise together, since density both consumes more and makes groups easier to control (rationing).
Think of control as a feedback loop or a vicious cycle. Scarcity leads to control…and the more “successful” that control is, the more scarcity results. In irrigation states like Mesopotamia, drought and a high population necessitated a sort of irrigation bureaucracy. But irrigation caused the salinization of soils, which led to even more scarcity, when led to even stronger central control. Once a system of control exists, it doesn’t go away when scarcity disappears…it invents new scarcities (taxes, debts, borders, artificial shortages) to keep power. This happens regardless of the ideology or political system. This isn’t a fascism or capitalism story.
Let’s look at this from a predictive processing angle. Scarcity increases prediction errors (will I eat tomorrow?). Control systems offer social priors (“obey the priest, follow the ration schedule”) that reduce uncertainty at the cost of autonomy. People trade independence for predictability. The control system becomes what guarantees your survival.
Can you guess what peaks with resource scarcity and population density? You got it…human domestication (and domestication in general).
After the last glacial maximum (12,000-20,000 years ago), we saw mass megafauna extinctions and human population growth. In other words, serious local scarcity. During the early holocene (10,000-12,000 years ago), human population density rose in fertile regions (Levant, Yangtze, Andes).
And this is where we really see scarcity management become chronic.
The average human brain shrank by ~10-15% beginning ~30,000 years ago, with the sharpest decline between 10,000-20,000 years ago…exactly the same window when density/settlement intensified. Bones became lighter and less robust ~15,000 years ago (this is linked to sedentism/reduced mobility). Male and female skeletal differences narrowed in the same timeframe. And signs of hierarchy and control systems all emerge right as density and scarcity peak.
The feedback loop is hard to miss. Density produces scarcity (real and perceived), scarcity drives new control systems, control systems select for predictability/attenuation (flattening diversity of responses to it), domestication traits become more pronounced, and those traits, in turn, make populations more compatible with density and hierarchy…accelerating the cycle.
The loop shapes landscapes, plants, animals and people. What thrives under high-density scarcity-control systems is predictable, compliant, and attenuated. And across millennia, this produces the domesticated phenotype…flatter, more manageable humans. The loop is called civilization. It entrenches domestication traits and expands until it collapses.
(Christopher Ryan and some archaeologists have an abundance-first model…but it leads to the same loop…once the abundance is gone, you have a sedentary group of people living in scarcity…I think this probably happened in certain places at certain times.)