What Is Social Capital — and Why Do Friends Matter?

What Is Social Capital?

Social capital (Sozialkapital) refers to the resources that arise from social relationships and networks. The core idea is simple: relationships count (Field, 2003). They count subjectively for the people in them and collectively for society.

Burt (2005) defines social capital as the advantage derived from an individual’s position within a relational structure: the more relationships someone maintains, the higher their social capital and the easier it becomes to obtain information or achieve goals.

Bourdieu (1980) emphasized that social capital is the totality of resources resulting from a network of daily interactions — hence the constant effort required to maintain relationships. Coleman (1988) added, through his Theory of Rational Choice, that personal satisfaction is the motive behind social cooperation.

Bourdieu, Coleman, and Putnam

The three founding figures of social-capital theory set different emphases. Bourdieu views social capital as part of a broader concept of capital alongside economic and cultural capital. Coleman stresses rational choice: people invest in reciprocal relationships because they benefit from them.

Putnam (2000) popularized the concept with Bowling Alone and warned of an erosion of social capital through media use. He was the first to distinguish between bonding and bridging social capital — a distinction of great importance for understanding different types of friendship and network structures.

Why Friendship Is Capital

Friendships are voluntary, informal relationships whose continuation depends entirely on the efforts of those involved. This makes them a prime example of the continuous investment that social capital requires. The social networks in which friendships are embedded generate shared understanding, trust, and reciprocity.

The sense of belonging within friendship networks demonstrably increases as social capital grows (Damasio, Henriques & Costa, 2012). Unlike family or workplace relationships, friendships cannot fall back on institutional frameworks — every relationship must be actively renewed.

Three Pathways to Health

Veenstra (2004) distinguishes three pathways through which social capital affects health. In his study in Hamilton, Canada (N = 1,504), he identified:

Compositional effectsat the individual level — personal networks provide support and promote health-conscious behavior. Contextual effectsat the area level — a neighborhood’s collective social capital influences economic resources and environmental quality. Interactive effects— social capital interacts with neighborhood affluence or individual education.

This differentiation shows that the impact of friendship networks cannot be considered in isolation but must be situated in its spatial and social context.

Criticism of Instrumentalization

Coleman’s rational-choice approach is criticized for interpreting friendships too instrumentally. In reality, people maintain friendships not merely out of calculation but out of genuine emotional need. The simple equation “more relationships = more capital” ignores the quality of bonds.

Moreover, social capital is unevenly distributed: structural factors such as education, income, and individualization influence who can build how much. Putnam warned that media use could erode social capital — yet later studies showed that the internet does not necessarily accelerate this erosion and can even promote social capital.

Social-capital theory remains a multidimensional concept operationalized differently by different authors. For friendship research, its value lies in framing friendships not only as emotional relationships but as productive social resources.

Frequently Asked Questions

What is social capital?

Social capital refers to the resources that arise from social relationships and networks. Relationships count — subjectively for the people in them and collectively for society (Field, 2003). It is not a material asset but emerges from the continuous effort of maintaining relationships.

How are friendships connected to social capital?

Friendships are voluntary, informal relationships whose continuation depends entirely on the efforts of those involved. This makes them a prime example of the continuous investment that social capital requires. They generate trust, reciprocity, and belonging.

Can you build social capital?

Yes — through actively maintaining relationships. Regular meetups, mutual support, and shared activities increase social capital. Research shows, however, that it is unevenly distributed: education, income, and social position influence how much each person can build.

Is social capital measurable?

Indirectly, yes. Veenstra (2004) identified three measurable pathways: compositional effects (personal networks), contextual effects (neighborhood), and interactive effects (cross-level interactions). However, social capital is operationalized differently by different authors, which makes comparisons difficult.