he economic concept of networks refers to the structure of agents` interaction as well as to the economic property of positive externalities. This book describes the economics of networks from various perspectives among which are¤ classical approaches, methods derived from physics, theory of evolutionary games, and experimental economics. These different views shed a new light on the behaviour and interaction of economic agents, on networks and on related phenomena: e.g., emergence of stable macro structures from micro interactions, standardisation, diffusion, preservation of diversity, role of heterogeneity, local learning, surplus creation and surplus allocation. The book present¤s the state of the art and offers a unique opportunity to understand specific networks phenomena through different theoretical and experimental approaches.