From an analysis by the Associated Press:
Consider incomes for the average U.S. household. They ticked up 0.7 percent from 2008 to 2014, after taking inflation into account. But even that scant increase reflected mainly the rise in income for the richest tenth of households, which pulled up the average. For most others, incomes actually decreased — as much as 6 percent for the bottom 20 percent, at a time when the economy was mostly recovering.
Or consider employment. The U.S. economy has added a healthy average of roughly 200,000 jobs a month since 2011. Yet most have been either high-paying or low-paying positions. By the end of 2015, the nation still had fewer middle-income jobs than it did before the recession, according to the Georgetown University Center on Education and the Workforce.
That reflects what economists call the “hollowing out” of the workforce, as traditional mid-level positions such as office administrators, bookkeepers, and factory assembly-line workers are cut in recessions and never fully recover their previous levels of employment.
Part-time jobs surged in the recession, too, and remained high in the recovery, even while full-time work was slower to return. The number of full-time jobs has risen just 1.3 percent since December 2007, when the recession officially began. Part-time positions are up more than 12 percent.