Table A1 contains all the studies known to the author that assess whether the occupational and/or income hierarchy in cities polarizes or professionalizes on the basis of the polarization thesis in the global city theoretical framework and/or Hamnett's professionalization thesis. Several studies that are informed by these theories are omitted from the table, because the findings cannot be directly or indirectly categorized according to this scheme. Not included, for instance, are studies that assess income inequality measured as the difference between the poorest and richest urbanites (e.g. with Gini-coefficients), instead of the absolute or relative growth of income categories.