Income inequality is a top policy issue for the Obama administration and a focus of global private and public sector leaders at national and international forums. But what is driving income inequality, and what does it tell us about the future prospects for economic growth and social development? Most experts agree that the central determinant of income inequality is when the share of national income going to capital (interest, dividends, and other realized investment returns) increases relative to income going to labor (wages, salaries, pension benefits, and other work-related compensation such as insurance benefits and incentive-based compensation). A majority of…