The following is an except from an article by economist Emmanuel Saez at equitablegrowth.org:
Overall, income growth for families in the bottom 99 percent was good again in 2015 as it had been last year, marking the second year of real recovery from the income losses sparked by the Great Recession of 2007-2009. After a large decline of 11.6 percent from 2007 to 2009, real incomes of the bottom 99 percent of families registered a negligible 1.1 percent gain from 2009 to 2013, and then grew by 6.0 percent from 2013 to 2015. Hence, a full recovery in income growth for the bottom 99 percent remains elusive. Six years after the end of the Great Recession, those families have recovered only about sixty percent of their income losses due to that severe economic downturn.
In contrast, families at or near the top of the income ladder continued to power ahead. These families at or near the top of the income ladder did substantially better in 2015 than those below them. The share of income going to the top 10 percent of income earners—those making on average about $300,000 a year—increased to 50.5 percent in 2015 from 50.0 percent in 2014, the highest ever except for 2012. The share of income going to the top 1 percent of families—those earning on average about $1.4 million a year—increased to 22.0 percent in 2015 from 21.4 percent in 2014.
Income inequality in the United States persists at extremely high levels, particularly at the very top of the income ladder. Figure 1 shows that the incomes (adjusted for inflation) of the top 1 percent of families grew from $990,000 in 2009 to $1,360,000 in 2015, a growth of 37 percent. In contrast, the incomes of the bottom 99 percent of families grew only by 7.6 percent–from $45,300 in 2009 to $48,800 in 2015. As a result, the top 1 percent of families captured 52 percent of total real income growth per family from 2009 to 2015 while the bottom 99 percent of families got only 48 percent of total real income growth. This uneven recovery is unfortunately on par with a long-term widening of inequality since 1980, when the top 1 percent of families began to capture a disproportionate share of economic growth.