As I indicate before the empirical analyses of the previous few chapters, my focus is upon the tight nexus between global service ﬁrms and world cities (Figure 3.1, p. 59). What have been produced in the two previous chapters are conﬁgurations of how that nexus is expressed as geographies of services and cities across the world. As indicated in Chapter 3, the other agencies in world city network formation – nation-states and service sectors – have been found to be important. As expected, much of the interpretation has focused upon these agencies for understanding particular patterns. The previous chapter was sector orientated; in this chapter I have had more to say about states. However, there are two features that dominate the geographies uncovered which I can term ‘regional and hierarchical tendencies’.