CEO pay and the top 1%: How executive compensation and financial-sector pay have fueled income inequality | Economic Policy Institute
"Growing income inequality has a number of sources, but a distinct aspect of rising inequality in the United States is the wage gap between the very highest earners—those in the upper 1.0 percent or even upper 0.1 percent—and other earners, including other high-wage earners. Driving this ever-widening gap is the unequal growth in earnings enjoyed by those at the top."
