The last of the six tensions, and the one that splits the two greatest founders of the discipline. Marx on one side, Weber on the other, and a century of productive argument in between.

It sounds abstract. It is in fact the tension you will use most often, because it is the question you ask whenever you want to know why people do something that looks, from outside, like a bad deal.

The idea, in plain words

Marx: the material comes first

Karl Marx (4.1) gave the strongest materialist statement in social thought. Human beings must eat before they can philosophise; therefore how a society organises production is its foundation.

His architecture uses two levels. The base (or infrastructure) is the mode of production: the forces of production (technology, skills, resources) plus the relations of production (who owns what, who works for whom). The superstructure is everything else — law, politics, religion, education, art, morality, and the reigning ideas of the age.

The claim is that the base conditions the superstructure. Change how production is organised and law, family, religion and morality will follow — not immediately, and not mechanically, but reliably. Feudal ideas of honour and obligation fitted an agrarian order of lords and peasants; when production became industrial, an ideology of contract, individual freedom and formal equality came with it, because that is what wage labour requires.

The sharpest edge of the argument is ideology (4.1). The ideas that feel most natural in a society are frequently those that serve its dominant class — and, crucially, they do not feel like propaganda. They feel like common sense. Hence Marx's formulation that the ruling ideas of an epoch are the ideas of its ruling class.

Turn this on the wedding and you get a strong reading: the language of honour is not the cause of the expense. It is the way an underlying transfer of property, control of women's marriage, and consolidation of alliances gets experienced by the people carrying it out.

Weber: ideas can be causes

Max Weber (4.3) accepted much of this and refused the priority. Ideas, he argued, are not merely reflections of material interests. They can be causes in their own right, and to prove it he chose the hardest possible case: the origin of capitalism itself, the very thing Marx explained materially.

Weber's argument in The Protestant Ethic and the Spirit of Capitalism runs roughly like this. Capitalism requires more than markets and money, both of which had existed for millennia in many places. It requires a peculiar disposition: systematic, disciplined, restless accumulation, in which profit is reinvested rather than enjoyed, and work is pursued methodically as an end in itself. Where does such an odd personality come from?

Part of the answer, he suggested, lay in ascetic Protestantism: the idea of a worldly calling, the anxiety about salvation, the suspicion of idleness and luxury, and a discipline of self-examination. None of these was intended to build capitalism. Devout Calvinists were trying to be godly. But their conduct — hard work plus low consumption — produces accumulated capital as a by-product, and the resulting habits outlived the faith that generated them. Weber's melancholy conclusion is that the spirit escaped its religious shell and became the iron cage of rationalised modern life.

Note what makes this a good idealist argument rather than a lazy one. Weber does not say ideas float free. He specifies a mechanism (how a doctrine shapes daily conduct), locates it historically, and tests it comparatively — which is why he then spent years studying Confucianism, Hinduism and Judaism, asking why comparable developments did not occur elsewhere. Those comparative studies are contestable and have been much criticised, especially for their reading of Indian and Chinese religion. The method, however, set the standard.

Weber also gave us a useful softer notion of causality: elective affinity — the idea that certain ideas and certain material interests fit each other and reinforce each other, without either simply causing the other. That concept is often the most honest answer available.

The century of qualification

Almost nobody now holds either pure position. The interesting work is in the middle, and four moves matter.

Engels' qualification. Even Marx's closest collaborator, late in life, complained that followers had turned the theory into a caricature. Engels insisted the base determines the superstructure only "in the last instance," and that political and ideological forms have their own effectivity. What "in the last instance" actually means has been argued about ever since — it is either a necessary refinement or an escape hatch, depending on whom you ask.

Gramsci and Althusser. Both Marxists, both granting the superstructure real power. Gramsci's hegemony (5.6) makes culture a site of struggle rather than a reflection — which is why he thought a "war of position" in schools, newspapers and churches was as important as any economic fight. Althusser (5.6) spoke of ideology as having "relative autonomy," and located it in concrete institutions — his Ideological State Apparatuses. Ideology, for him, is not false ideas in heads but a material practice you perform: you kneel, you queue, you fill in the form.

Cultural sociology's counter-attack. Jeffrey Alexander's "strong program" (5.12) argues that culture is autonomous, with its own internal logic of meaning, and should never be treated as a dependent variable. Ann Swidler (2.1, 5.12) offers a more supple picture: culture is not a script that determines action but a toolkit of repertoires, from which people select according to circumstance. That single reframing dissolves a great deal of the old argument.

Bourdieu's bridge. Perhaps the most useful synthesis (5.10). Bourdieu refused to separate the material and the symbolic by treating both as forms of capital — economic, cultural, social, symbolic — that can be accumulated, invested, and converted into one another. A degree (cultural) converts into a salary (economic); money converts into taste, and taste into marriageability, and marriageability back into money. Honour is not the opposite of wealth; it is another currency with an exchange rate.

Return to the wedding and Bourdieu explains it better than either founder alone. The family is spending economic capital to acquire symbolic capital — a good name — which in that town is convertible into credit, marriage prospects for the younger children, and protection in a dispute. That is not irrational. It is investment in the currency that actually circulates there.

Go deeper

How to actually tell, in a given case

Four practical tests, none decisive alone.

Does it survive when the material interest disappears? If a practice persists after the economic arrangement that supposedly generated it has gone, ideas are carrying real weight. If it collapses the moment the money changes, they were probably not.

Does it appear wherever the material conditions appear? If similar economic arrangements in different cultures produce different institutions, materialism alone is insufficient. This is why comparison (7.6) is the workhorse method for this whole question.

Who pays for the idea? Ideas require carriers: priests, schools, newspapers, universities, film industries, platforms. Following that funding often reveals the material scaffolding under a "purely cultural" phenomenon — without making the phenomenon fake.

What does the practice cost the people doing it? People sometimes act against their material interest for meaning — martyrdom, dowry, honour, renunciation, fasting. These cases are the strongest evidence that meaning is causal. Any materialism that cannot handle them is too crude.

Money is the counter-example that dissolves the dichotomy

Recall the banknote from 1.3.3. Is money material or ideal?

It is unmistakably material: it buys food, it is unequally distributed, it constrains bodies. And it is entirely ideal: it consists of shared belief, and it evaporates when belief does.

That is not a paradox to be resolved. It is a demonstration that the material and the ideal are not two separate realms with a boundary between them. Every social institution has both a physical existence and a meaning, and neither can be subtracted. Wage labour is an arrangement of bodies and a doctrine about what a person owes; a factory is a building and an idea about time.

The sophisticated position, then, is not "both matter" — that is a truism. It is: material arrangements are always meaningful, and meanings are always materially carried. Your research task in any case is to trace how the two are locked together, and which is currently moving.

One live example: climate

Why do societies that fully accept the physical facts of climate change act so slowly?

A materialist answer: fossil energy is embedded in every profitable activity, enormous asset values depend on it, and those who hold those assets have organised political power. A culturalist answer: our conception of the good life, freedom, mobility, meat, growth and modernity is built around energy abundance, and no one has yet made an appealing story out of using less.

Both are true. Neither alone would produce a working strategy — and that is exactly why this tension is not academic. Read 11.5 with this lesson in mind.

Why it matters

It is the diagnostic tool for anything that looks irrational. Whenever behaviour makes no sense on the numbers — the wedding, the funeral, the pilgrimage, the strike that costs more than it wins, the expensive phone in a house without a toilet — you now have two hypotheses instead of a verdict. Nine times out of ten the answer involves a currency you weren't counting.

It determines what you think will work. If a practice is materially driven, changing incentives will move it. If it is meaning-driven, incentives alone will not, and you need legitimacy, exemplars and public argument. Get the diagnosis wrong and the intervention fails — which is the history of a great many well-intentioned reform programmes (and 12.2, on policy sociology, is largely a study of that history).

And it is the argument that makes Part 6 essential rather than decorative. The claim that non-Western societies are governed by tradition and belief while the West runs on rational economics is one of the oldest and least examined ideas in social science. Weber himself came close to it. Once you have this tension properly in hand, you can see that every society runs on both — and you can ask why only some got described as driven by "culture."