This ground-breaking book offers a coherent theoretical analysis of contemporary industrial knowledge flow dynamics. Furthermore, it advances wide-ranging and varied empirical findings from international comparative research which demonstrate that knowledge cross-pollination, often from industrially unrelated business sectors, is now commonplace in the economics of innovation. This, the authors argue, represents the rise of an externalized ‘matrix’ of knowledge flow dynamics among firms and industries. The book also examines related economic governance research that reveals the catalytic role that leading innovation policy agencies play in animating knowledge flow dynamics, particularly at the regional level. The chapters address various sectors including food and drink, biotechnology, ICT, new media, the automotive industry and tourism.