Much of the literature on institutions and social capital posits that trust is an important prerequisite to well-functioning markets (Arrow 1972; North 1981;Putnam 1993; Fukuyama 1995; Stiglitz 1999). Trust lowers transaction costs and facilitates cooperation among entities that might otherwise view mutually advantageous exchange as too costly or risky. Especially in places where third-party enforcement—that is, the state and its constituent legal and regulatory institutions—is weak or uncertain, a basic belief in a counterpart’s honesty is an “important lubricant” in a social and economic system (Arrow 1974). In these circumstances, trust can be built through repeated interactions, and the creation of a reputation for cooperating, even where incentives for shirking may be strong (Axelrod 1984).