This is the first book that performs international and intertemporal comparisons of uniform tax progression with empirical data. While conventional measures of tax progression suffer from serious disadvantages for empirical analyses, this book extends uniform measures to progression comparisons of countries with different income distributions. Tax progression is analyzed in terms of Lorenz curve and Suits curve equivalents of net incomes and taxes. The authors derive six distinct definitions of the relation "is more progressive than," which are then utilized for an empirical analysis of 13...