Take a look at animated graphs from The Urban Institute that paint the picture for the reason behind income inequality.
Why hasn’t wealth inequality improved over the past 50 years? And why, in particular, has the racial wealth gap not closed? These nine charts illustrate how income inequality, earnings gaps, homeownership rates, retirement savings, student loan debt, and lopsided asset-building subsidies have contributed to these growing wealth disparities.
Average wealth has increased over the past 50 years, but it has not grown equally for all groups. Between 1963 and 2013,
Read the full story here: http://datatools.urban.org/Features/wealth-inequality-charts/