D r.Jean-Pau lRodrigue ,Dep t.o fG loba lS tud ies & Geography ,Ho fstra Un ivers ity World C ities ,2012 Source :AT Kearney ,2012 G loba lC ities Index and Emerg ing C ities Ou tlook World C ity Index (2012) Fourth T ier (Less than 1 .25) Th ird T ier (1 .25 to 2 .5) Second T ier (2 .5 to 3 .5) F irstT ier (3 .5 and above)