The article argues that economic inequality inevitably generates politicalinequality, which in turn reproduces economic inequality. Basic concepts areintroduced first along with strong caveats concerning the quality of the crossnationaldata on income distributions; historical patterns of income inequalityare summarized next, and with these preliminaries, a distinction is made betweenredistribution of consumption at a particular time and equalization of incomeearning capacities over time. Following this economic considerations, the articlediscussion moves to political factors that may block redistributions.