Social Capital

In brief

Social capital is the idea that relationships are a kind of resource. Just as physical capital (tools, machines) and human capital (skills, education) make people more productive, the connections among people, and the trust and habits of cooperation those connections carry, make groups more capable. A neighborhood where people know and trust each other can watch each other's children, organize against a factory closure, or simply keep the streets safe in ways that an atomized set of strangers cannot. The term was given its modern shape by three thinkers working largely apart: the French sociologist Pierre Bourdieu, the American sociologist James Coleman, and the American political scientist Robert Putnam, whose book Bowling Alone (2000) turned an academic concept into a national conversation about the fraying of American community.

The full treatment

The problem it answers

Economists and political scientists had long puzzled over cooperation. Rational individuals, each pursuing their own interest, often fail to produce outcomes that would benefit everyone, the situation dramatized by the prisoner's dilemma and by the general problem of collective action described by Mancur Olson in 1965. Why do people vote, volunteer, pay taxes honestly, or refrain from cheating when free-riding would pay better? Part of the answer is that people are not isolated calculators. They are embedded in networks that reward trustworthiness and punish betrayal, that let a favor today be repaid years later, and that carry reputations from one encounter to the next. Social capital names the feature of social structure that makes this cooperation possible. It is what allows a group to act as more than the sum of its members.

How it works

Three components recur across the definitions. First, networks: the actual ties among people, dense or sparse, overlapping or isolated. Second, norms, especially the norm of generalized reciprocity, the expectation that a good turn will eventually be returned, not necessarily by the same person. Third, trust, the willingness to rely on others without a guarantee. These reinforce one another. Dense networks let information about who is reliable travel quickly, which strengthens norms, which makes trust rational, which makes people more willing to build ties. Coleman's example is the diamond merchants of New York, who hand over bags of stones for private inspection with no formal contract, secure in a tight community where cheating would end a career and a reputation at once. The bag of diamonds moves on trust, and the trust rests on the closed network around it.

The founders, and their different emphases

The three founders did not mean quite the same thing. Pierre Bourdieu (1930 to 2002), in "The Forms of Capital" (1986), treated social capital as a private asset: the resources an individual can draw on through membership in a group, convertible in the end into economic advantage, and a mechanism by which elites reproduce their position. For Bourdieu it was a story about power and exclusion. James Coleman (1926 to 1995), in his 1988 article and his book Foundations of Social Theory (1990), defined it functionally, as any feature of social structure that facilitates action, and stressed its role in creating human capital, showing for instance that tightly knit communities lowered the school dropout rate. Robert Putnam (born 1941) made the decisive move to the level of whole communities and nations. In Making Democracy Work (1993), a study of why regional governments performed so differently across Italy, he traced the gap to centuries-old traditions of civic engagement in the north. Where citizens joined choral societies and soccer clubs and cooperatives, government worked better. Social capital, for Putnam, is a public good: a property of a place, not just a private holding.

The distinction that matters: bonding and bridging

Putnam's most useful refinement is the distinction between bonding and bridging social capital. Bonding capital ties together people who are alike: family, ethnic enclaves, close-knit congregations. It is inward-looking, good for "getting by," for mutual support and solidarity. Bridging capital connects people across social lines: a rotary club, a diverse civic group, a coalition of strangers. It is outward-looking, good for "getting ahead," for spreading information and building broad cooperation. Both are valuable, but they do different work, and they can pull in opposite directions. A society thick with bonding capital but thin on bridging capital can be one of warm in-groups and deep distrust between them, cohesive at the level of the clan and dysfunctional at the level of the nation. The sociologist Mark Granovetter had earlier captured a related insight in his 1973 paper "The Strength of Weak Ties": it is often loose acquaintances, not close friends, who deliver a new job lead, because they reach into networks your intimates cannot.

Lineage

The concept's deepest root is Alexis de Tocqueville (1805 to 1859), who in Democracy in America (1835 and 1840) argued that the vitality of American democracy rested on its extraordinary density of voluntary associations, which trained citizens in the habits of cooperation and stood as a buffer between the individual and the state. Putnam names Tocqueville explicitly as his ancestor. The term "social capital" itself was used as early as 1916 by the American educator L. J. Hanifan, describing rural school communities, and appears in scattered later work, but its rigorous development belongs to Bourdieu, Coleman, and Putnam in the 1980s and 1990s. The idea also draws on the older sociological tradition of Emile Durkheim's concern with social solidarity and on the collective-action theory of Mancur Olson.

The strongest case for it

The concept earns its keep because it explains real variation that individual-level factors cannot. Putnam's Italian study is the cleanest demonstration: regions with identical formal institutions, granted the same powers in the same year, performed very differently, and the best predictor was the historical density of civic association, not wealth or party. Social capital gives a name and a measurable form to something everyone senses, that some communities simply work better, that trust is an asset a society can accumulate or squander. It bridges economics, sociology, and political science with a single vocabulary. And it carries a practical payload: if trust and association are causes of good government, prosperity, and public health (and studies have linked higher social capital to lower crime, better schooling outcomes, and even longer life), then they are things a polity might deliberately cultivate rather than merely hope for.

The strongest case against it

The idea has drawn heavy and specific fire. The sharpest critic, the sociologist Alejandro Portes, in his 1998 survey, argued that social capital had become almost circular: it is defined partly by its effects, so that wherever cooperation succeeds we say social capital was present, and wherever it fails we say it was absent, which explains nothing. Portes also insisted on the concept's dark side, which Putnam underplays: the same tight networks that produce trust also produce exclusion, conformity, and the downward leveling of ambition. The Mafia, after all, runs on dense bonding capital. Deirdre Royster's research on how white working-class men used their networks to lock Black men out of skilled trades shows social capital operating as a machine for exclusion, exactly Bourdieu's original point and the opposite of Putnam's warm civic story.

A second line of attack targets the decline thesis directly. Putnam's claim in Bowling Alone (2000), that Americans since the 1960s have withdrawn from clubs, churches, unions, and even league bowling, and that television and generational change are the culprits, was challenged on the data. Critics such as Robert Wuthnow and Everett Ladd argued that Americans had not stopped associating but had shifted to newer, looser, less countable forms of connection, and that older membership surveys missed them. A third objection, pressed from political sociology, is that Putnam looks in the wrong place. Theda Skocpol, in Diminished Democracy (2003), argued that the real change was not individual apathy but a top-down transformation: the great cross-class membership federations that once knit ordinary Americans into national civic life were replaced by professionally managed advocacy groups run from Washington, a change in the structure of organizations, not in the character of citizens. On this view social capital did not evaporate; it was reorganized by elites, and blaming the individual watching television gets the causation backwards.

Where it stands now

Social capital is now a permanent part of the vocabulary of the social sciences and of public policy; the World Bank, the OECD, and public-health researchers all measure and invoke it. The core insight, that trust and association are real resources with real consequences, is widely accepted. The contested questions are the interesting ones. Did American community actually decline, and if so why? Has the internet destroyed social capital, merely relocated it online, or built new kinds, a debate Putnam himself continued in later work? Is the concept precise enough to be a genuine cause, or is it a suggestive label for a bundle of different things? The idea remains most persuasive at the level Putnam pitched it, as a claim that the health of a democracy depends on the ordinary, unglamorous fabric of connection among its citizens, and most vulnerable where it slides toward treating any social good as evidence of a single underlying stock.

Test yourself

Think of a group you belong to that reliably gets things done: a neighborhood, a team, a congregation, a friend group. What actually makes cooperation easy there, the specific ties, favors owed, and reputations at stake? Now ask the harder question Portes would press: who is quietly kept out to keep that trust so dense, and would you call that exclusion a strength of the group or a cost the concept lets you overlook?