The main results of the essay are as follows. Social trust induces cooperation even in one-period prisoner's dilemmas. Fixing a game, the amount of social trust is determined by the distribution of players' cooperative tendency which in essence is a component of human capital distinct from cognitive ability.
Social capital, concept in social science that involves the potential of individuals to secure benefits and invent solutions to problems through membership in social networks. Social capital revolves around three dimensions: interconnected networks of relationships between individuals and groups.