America's Gini coefficient has risen from 0.34 in the 1980s to 0.38 in the mid-2000s.

ECONOMIST: Brains bring ever larger rewards

One thing they all have in common is that their income inequality, as measured by the Gini coefficient, is well below that of the US. In fact, the Scandinavian and German-speaking countries that consistently score well on a variety of business and quality-of-life surveys have some of the lowest inequality scores among developed nations.

FORBES: Is Capitalism Dying?