The huge gap between America's rich and superrich exposes a fundamental misunderstanding about inequality

Stuart C. Wilson/Stringer/Getty Destabilizing levels of income inequality, once a problem reserved for developing nations, is now a defining social and political issue in the United States. Donald Trump seized on the issue during the presidential campaign, vowing to become a voice for forgotten Americans left behind by decades of widening wealth disparities. While America's enormous gap between rich and poor and the sorry state of its middle class are well-documented, a less prominent trend tell...