
Thus they are subject to agglomeration economics, and tend to cluster in a limited number of cities. These services are often complex and require highly specialized skills. These complex, globalized production networks require new forms of financial and producer services to manage them. In short form, in the age of globalization, the activities of production are scattered on a global basis. She gave a definition that has long struck with me. Saskia Sassen literally wrote the book on global cities back in 2001 (though her global cities work dates back well over a decade prior to that book).

We hear a lot of talk these days about so-called “global cities.” But what is a global city?
