Definition
A hierarchy is a linear ranking of agents — individuals, groups, or roles — by unequal access to limited resources, decision-making, and prestige. Hierarchies appear wherever beings live in close proximity: in hen yards, wolf packs, chimpanzee troops, corporate org charts, religious orders, caste systems, and nation-states. Across primates the surface form is similar; in humans the content becomes uniquely elaborate — we obey not just an individual leader but the abstract idea of Authority, and we wrap our rankings in stories about gods, biology, merit, or destiny.
Three traditions converge on the same structural fact and read it differently. Sapolsky's neurobiology treats hierarchy as a measurable physiological reality with health consequences. Harari's history treats every specific hierarchy as a contingent accident later disguised as natural law. The Great Mental Models treats hierarchy as a recurring biological adaptation with predictable costs and benefits. Together they describe one phenomenon at three altitudes.
Why it matters
How it works
The biology — rank as a physiological fact
Sapolsky's topic on hierarchy in Behave begins from the observation that the brain detects rank in about forty milliseconds, faster than it consciously registers a face. Infants track it. Other primates obsess over it. Across species, attaining high rank often turns on size and fighting skill, but maintaining it turns on social intelligence and impulse control — knowing which provocations to ignore, which coalitions to nurture, which low-status allies to feed. The cost of low rank is real and biological: chronically elevated stress hormones, immune suppression, shorter lifespans. The cost of high rank is also real, though differently distributed: constant vigilance, the calorie burn of impulse suppression, the strain of never being able to safely lose face.
What makes the human version unusual is that we invented socioeconomic status — a form of subordination unlike anything in the primate world, in which a rank you cannot see and an authority you have never met can still reorganize your body. The health gradient that follows socioeconomic rank is one of the most replicated findings in epidemiology, and it tracks not absolute deprivation but relative position, which is a uniquely social fact dressed up as a biological one.
Obedience to authority — the move from rank to Authority
Hierarchies generate strong pulls toward conformity and obedience long before they generate explicit coercion. Most of the time most people comply not because they have weighed the demand but because the demand came from someone or something further up the ladder, and rank itself is a heuristic the nervous system trusts. The Milgram and Asch traditions that Sapolsky reviews show how reliably and how cheaply that pull operates — most people will administer what they believe to be dangerous shocks, deny the evidence of their own eyes, and rearrange their stated preferences to match a hierarchy they joined ten minutes ago.
Resistance becomes likely in a narrow window: when the demand clashes sharply with one's values and the right thing has been made the easier thing. Moral heroism, on this account, is rarely a triumph of frontal willpower; it is what happens when an institution has built the path of least resistance to align with conscience — an anonymous whistle-blower channel, a credible promise of non-retaliation, a culture in which speaking up is the default rather than the exception. Hierarchies that depend on obedience can be redesigned to depend on it less, but only if the redesign reaches all the way down to which behaviour costs less.
Hierarchy as imagined order — Harari's structural claim
By the time human groups outgrew face-to-face acquaintance, biology had run out of tools to organise them. A chimpanzee troop is held together by personal recognition; a city of ten thousand is not. The gap is filled by what Harari calls the imagined order: a shared belief about gods, laws, money, and rank that is convincing enough to coordinate strangers. Hammurabi's Code (c. 1776 BCE) declares the gods established a hierarchy of superiors, commoners, and slaves, and that this is the order of the universe. The American Declaration of Independence (1776 CE) declares all men are created equal, endowed by their Creator with inalienable rights, and that this is the order of the universe. Both claim cosmic authority. Both contradict each other absolutely. Both are imagined orders, no more empirically true than the other.
Imagined orders work best when no one notices they are imagined. A medieval European believed in feudal estates the way a fish believes in water. The moment an order becomes visible as a story it is already weakening. Most of the social arrangements you take for granted today will look obviously contingent to someone two centuries from now — and the project of justice depends precisely on shortening that window of invisibility.
The vicious circle that locks an accident into "nature"
Harari's argument in There is No Justice in History is that no hierarchy starts from a real biological asymmetry — they all start from a contingent advantage, then run the same closed loop. An accidental event (a conquest, a plague, a geography that gave one group early access to a resource) is locked in by an early law or norm. Resources, jobs, and education are denied to the losers. Outcomes diverge across generations. Observers see the gap and reinterpret it as evidence of innate difference. That reinterpretation is then used to justify the original denial. The loop closes and tightens.
The audit for any hierarchy presented as natural is three questions: what historical accident installed it, what laws or customs perpetuated it across generations, and what gap between groups is now being read as evidence of essence? When debating meritocracy specifically, separate the empirical question — are abilities distributed unequally? (often yes) — from the political one — did everyone have equal access to develop them? (almost never). Conflating the two is the favoured trick of the powerful, because it lets the closed loop look like a measurement.
Three reinforcing pillars
A specific hierarchy persists not because any one pillar holds but because three of them carry the load together. Material control concentrates resources at the top, so the next generation inherits advantage and the playing field tilts before anyone steps onto it. Cultural narrative encodes the ranking as natural, sacred, scientific, or meritocratic, so questioning it feels deviant rather than reasonable. Institutions and infrastructure — temples, capitals, schools, courts, anthems, rituals — formalize the differential treatment and surround citizens with daily reminders of the order. Knocking out one pillar is rarely enough; the other two carry the load while the missing one regenerates. Reform usually requires disturbance from outside the system — war, plague, technological shift, contact with a society organised differently — that breaks at least two loops at once.
Empires — the largest hierarchies, and their second life
Empire is the most common form of large-scale government for at least the last 2,500 years, and the most durable: an empire is violent at the start and remarkably stable thereafter, often for centuries. Its second-life trick is what makes the imperial hierarchy uniquely persistent. Long after the political empire falls, the idea of the empire — its language, law, cuisine, religion, units of measure — is inherited by the very peoples who once resisted it. Spanish patriots venerate Numantian rebels in Spanish, a Latin-derived language. Indian nationalists shaped their independence movement in English. Anti-imperial movements often turn out to defend imperial cultural inheritance, just stripped of foreign administrators. Hierarchies of this scale win twice: once on the battlefield, and again when the rebels adopt the empire's vocabulary to denounce it.
The biological model — hierarchies as adaptations with costs
The Great Mental Models, Vol. 2 treats hierarchy as one of ten biological mental models alongside selection, adaptation, niches, cooperation, and energy minimization. The argument is descriptive rather than prescriptive: linear dominance rankings emerge wherever individuals live close to one another, in hens and wolves and chimps and humans, whether or not anyone wants them. They reduce fighting and produce coordination — clear benefits — at the cost of suppressing low-status voices (a clever feeding strategy from a low-ranking chimp does not propagate just because she is low-ranking) and inflicting stress on those at the top and the bottom alike.
Two case studies in the topic dramatise the durability of the pattern. The French Revolution overthrew the Estates system, replaced it with the Terror, and within twenty-five years had Napoleon installing absolutism in everything but name — a new hierarchy structurally similar to the one France had bled to abolish. The 2010 Copiapó mine collapse is the more intimate version: thirty-three trapped miners initially had no functioning hierarchy because their shift foreman was new; in survival conditions a hierarchy emerged spontaneously (formal foreman, natural leader, spiritual leader, distributor of food), held until rescue began, then broke down as outside hierarchies — media, doctors, families — reasserted themselves. The practical question, the topic concludes, is never whether to have a hierarchy but what kind, with which kind of leader, accountable to which interests.
Hierarchy and cooperation are not opposites
The cooperation topic of the same volume sharpens the point. Cooperation at scale produces emergent properties no rigid command structure could orchestrate: a symphony orchestra at full trust sounds like a flock of birds — no clear leader, no rigid chain of decision, just deep mutual calibration. The Montreal Women's Symphony Orchestra (1940) succeeded because women across class, religious, and ethnic divides committed absolutely to a shared goal. Yuval Harari extends the move to civilization itself: humans cooperate at planetary scale through shared belief in fictions like money, nations, and laws, and that capacity is the species' single greatest evolutionary innovation. Cooperative hierarchies — hierarchies tuned for trust and accountability rather than dominance and surveillance — are the form most of modern infrastructure actually runs on, even when the org chart looks like a pyramid.
Why even genuine differences require a hierarchy audit
Even where talent is unequally distributed, the hierarchy does most of the work in determining whether that talent is developed, recognised, or rewarded. Talent only shows up when nurtured, and the same closed loop that installs an unjust hierarchy also throttles the conditions under which talent appears in the disfavoured group. This is the move that lets defenders of any specific hierarchy point at outcomes and say "look, the ranking matches ability." The reply is structural: the ranking shaped which abilities had a chance to develop. The audit questions are the same as before.