Everything in this topic so far has emphasised variation. Cultures differ; the familiar is arbitrary; your disgust is local. That emphasis is correct and it is only half of an honest account.

Because if you look across all known human societies, something else appears: a short list of things that show up everywhere, in radically different forms. Making sense of that combination — universal problems, particular solutions — is the subject of this lesson, and it is one of the most useful analytic frames in the discipline.

The idea, in plain words

What is actually on the list

The classic inventory is George Peter Murdock's (1945), drawn from cross-cultural survey work. His list runs to several dozen items and includes: age grading, athletic sports, bodily adornment, calendar, cleanliness training, community organisation, cooking, cooperative labour, cosmology, courtship, dancing, division of labour, education, ethics, etiquette, family, feasting, food taboos, funeral rites, games, gestures, gift-giving, greetings, hairstyles, hospitality, housing, hygiene, incest taboos, inheritance rules, joking, kin groups, kinship nomenclature, language, law, magic, marriage, mealtimes, medicine, mourning, music, mythology, numerals, obstetrics, penal sanctions, personal names, property rights, propitiation of supernatural beings, puberty customs, religious ritual, residence rules, sexual restrictions, soul concepts, status differentiation, surgery, tool-making, trade, visiting, weaning, weather control.

Read that list slowly, because two things about it are striking.

First, how thin each item is. "Marriage" is on the list; who may marry whom, how many, arranged by whom, with what property implications, and whether it can be ended, varies without limit. The universal is the category, not the content.

Second, how much it tells you anyway. Every society has music, games, jokes, names, decoration of the body, and a story about where things came from. That is not a trivial finding about a species.

Some robust candidates worth singling out:

Language. Every known society has a full grammatical language. There are no "primitive" languages; complexity is universal, though it is distributed differently across subsystems.

Incest prohibition. Every society prohibits sex and marriage within some close category of kin. Which relatives count varies enormously — cross-cousin marriage is preferred in much of south India and prohibited in much of the north (Karve, 6.2.8) — but the existence of a prohibited category is universal. Lévi-Strauss (5.9) built his structuralism on this, arguing the prohibition is what forces groups to exchange partners and thereby creates society through alliance.

Kinship classification. Every society sorts relatives into named categories with attached obligations, and the categories never simply mirror biology (2.1.5).

Some status differentiation. Even the most egalitarian recorded societies distinguish by age, sex, and skill. Note carefully what this does not license: the observation that all societies have some differentiation says nothing about the enormous variation in how much and on what basis, which is precisely 1.2.2's warning against sliding from "inequality exists" to "this inequality is inevitable."

Reciprocity. Every society has norms of giving and returning — Mauss's gift (1.4.2) — though what must be given, to whom, and how promptly differs completely.

Ritual marking of transitions. Birth, adulthood, marriage, death. Arnold van Gennep (1909) identified a recurring three-phase structure in rites of passageseparation from the old status, a liminal phase betwixt and between, and reincorporation with the new status — later developed by Victor Turner, who added the concept of communitas: the intense equality and fellow-feeling among those undergoing the liminal phase together. It is one of the most transferable ideas in this course: you will recognise it in initiation rites, military training, medical residency, and the strange intense bonding of anyone going through a shared ordeal.

Go deeper

Why universals exist: three sources

Shared biology. Humans are born helpless and need years of care; we eat, sleep, reproduce, age and die; we have limited memory and a particular sensory apparatus. Any workable arrangement must accommodate these. Hence: child-rearing arrangements everywhere, food rules everywhere, death rites everywhere.

Shared functional problems. Every society that persists must solve a recurring set of tasks: produce subsistence, allocate it, raise and socialise the next generation, coordinate action, handle conflict, and give an account of the world. This is the intuition behind functionalism (5.1) and behind Parsons' AGIL — and note that the functionalist error was never noticing the problems, it was assuming the existing solution was the necessary one (1.3.4).

Diffusion and common descent. Some apparent universals are not independent inventions but shared inheritances or borrowings. All human languages may descend from a common ancestry; agriculture, writing, and religions have spread. Anthropologists call the resulting problem Galton's problem: societies are not independent cases, so a trait shared by many may be one event, not fifty. This matters enormously for any comparative claim, and 7.6 returns to it as a methodological issue.

Universals and the politics of human nature

This lesson has a political edge, and you should see it clearly, because claims about universals are used in arguments.

Claims that something is universal are regularly deployed to argue it is natural and therefore right: hierarchy, male authority, the family in a particular form, war, private property. The logical error is old and has a name — deriving an ought from an is — and there is a second, empirical error stacked on top of it: the claimed universal usually turns out on inspection to be far less universal than asserted, or universal only at a level of abstraction that permits the opposite arrangement.

Take "the family is universal." True at the level of some arrangement for raising children. Not true at the level of the co-resident nuclear household with a breadwinning father, which is a specific and historically recent form. The move from the first to the second is where the smuggling happens (9.1).

Conversely — and 1.5.3 requires this balance — the denial of all universals can be a political move too, and it is not more honest for being progressive. If nothing is shared, cross-cultural understanding, translation, solidarity and human rights all become unintelligible (2.1.8). Some of the strongest arguments against oppressive practices rest precisely on shared human vulnerabilities: people everywhere can be hurt, coerced, humiliated and deprived, and recognise these in each other.

Where the frontier is

Two contemporary conversations worth knowing exist, both of which you will meet later.

Cross-cultural psychology and the WEIRD problem. A now-famous critique observed that a very large share of published behavioural research uses subjects from Western, Educated, Industrialised, Rich, Democratic societies, and that on a number of measures — perception, reasoning about fairness, sense of self — those populations are outliers rather than representative. The implication is precisely this lesson's: results generalised from one narrow sample were mistaken for human universals. It is the psychological version of the critique Part 6 makes of sociology.

Multiple modernities. The macro version (6.7, 11.6): societies face similar problems under industrial conditions — urbanisation, bureaucracy, mass schooling, wage labour — and solve them in durably different ways shaped by their own histories. Universal problems, particular solutions, at the scale of civilisations.

Why it matters

It gives you the single most useful comparative frame in the discipline. Universal problem, particular solution. Apply it to anything — funerals, marriage, childcare, punishment, greeting, hospitality, retirement — and you immediately have two questions instead of a shrug: what problem is this solving, and why this solution here?

It stops both cheap moves. "Everyone does it, so it's natural" and "everything is different, so nothing can be compared" are both lazy, and this lesson disarms them together.

It licenses a global sociology. Part 6 is only possible if comparison is possible; comparison is only possible if there are shared problems to compare solutions to. This lesson is the warrant for the whole comparative enterprise — and, in its critique of Murdock's grid, also the warning about how to conduct it.

And van Gennep's rites of passage will follow you everywhere. Separation, liminality, reincorporation, communitas: once you have this, you will see it in a wedding, an initiation, a hospital stay, a training programme, a prison sentence and a first term at university.