It's indisputable fact that income inequality in the United States has grown substantially in the past few decades.
Median nominal incomes, adjusted for inflation, have not gone up in the USA since the 50's. (Median is the halfway point, so we are talking about the middle-earner). In contrast, the per capita GDP has risen quite dramatically, due to the increased purchasing power of the upper echelon.
I pose three questions to you:
1.) What has caused this phenomenon
2.) What are the long term implications if the trend is allowed to continue
3.) What, if anything, should be done to adjust our course