Machine generated contents note: 1.Introduction: the poor craftsman and the wealthy inventor -- 2.Methods for an analysis of economic growth and network effects -- 3.A literature review: models of economic growth -- 4.Network economies -- 5.A complex model of growth, technological change and network effects -- 6.Case study: the information and communication technology sector and economic growth -- 7.Conclusions: the technologies, the networks and the next wave of growth.