The economic importance of social interactions not mediated by the market has long been recognized. However, it is only the emergence of network analysis that has supplied a useful method of study. The editors have performed a signal service by their anthology of important articles. They have covered all the major studies and represented well the rapid emergence of a new and important field, to which they have been among the most significant contributors.' - Kenneth Arrow, Stanford University, US.This comprehensive two-volume set brings together important contributions providing fundamental economic analyses of social networks and the central roles they play in many facets of our lives.