“…This study builds on an interdisciplinary world city literature that has explored large cities and major cities for more than a half-century. It includes the early and later work on primate cities (Jefferson, 1939 ; Martin, 1961 ; Linsky, 1965 ; Mayer, 2019 ), world cities (Hall, 1966 ), hierarchies (Sassen, 1991 , 1994 , 2002 , 2004 , 2010 , 2018 ; Taylor, 1997 ), networks and structures (Amin & Thrift, 1992 ; Castells, 1996 ); information producer cities (Storper, 1997 ), connections and flows (Soja, 1989 ; Short et al, 1996 ; Kim, 1999 ; Short & Kim, 1999 ; Mitchelson & Wheeler, 1994 ; Smith & Timberlake, 1995 ), and hierarchies and systems (Beaverstock et al, 1999a , 1999b , 2000a , 2000b , Boulton et al, 2011a , b ; Taylor, 1997 , 2004 ; Krãtke and Taylor, 2004 ; Taylor & Deridder, 2004 ; Taylor et al, 2007 ; Taylor et al, 2015 ).…”