See Saskia Sassen, The Global City: London, New York, Tokyo (Princeton, NJ: Princeton University Press, 1991); Globalization and its Discontents: essays on the new mobility of people and money (New York: The New Press, 1999); Cities in a World Economy (SAGE, 2018). See Doreen Massey, Spatial Divisions of Labor: social structures and the geography of production (Hove: Psychology Press1995); World City (Hoboken, NJ: Wiley, 2007).
2.
Doug Saunders, Arrival City: how the largest migration in history is reshaping our world (London: Penguin Random House, 2012).