“For now, the interactions of networks and hierarchies are more important. Networks are not planned by a single authority; they are the main source of innovation but are relatively fragile. Hierarchies exist primarily because of economies of scale and scope, beginning with the imperative of self-defense. To that end, but for other reasons too, hierarchies seek to exploit the positive externalities of networks. States need networks, for no political hierarchy, no matter how powerful, can plan all the clever things that networks spontaneously generate. But if the hierarchy comes to control the networks so much as to compromise their benign self-organizing capacities, then innovation is bound to wane.”