A society that relies on generalized reciprocity is more efficient than a distrustful society, for the same reason that money is more efficient than barter. Trust lubricates social life. Networks of civic engagement also facilitate coordination and communication and amplify information about the trustworthiness of other individuals.

Bowling Alone: The Collapse and Revival of American Community (ed. Simon and Schuster, 2001) - ISBN: 9780743203043