Book excerpt: Infrastructure represents the core underpinning architecture of the global economic system. Adopting an approach informed by realism, this insightful book looks at the forces for the integration and fragmentation of the global infrastructure system. The authors undertake a thorough examination of the main internationalised infrastructure sectors: energy, transport and information. They argue that the global infrastructure system is a network of national systems and that state strategies exert powerful forces upon the form and function of this system.