Changing distribution of income growth during periods of economic expansion:
For a long time, most of the gains from economic growth went to the bottom 90% of the income distribution. And, after all, the bottom 90% includes the vast majority of people. Since 1980, that hasn’t been the case. And for the first several years of the current expansion, the bottom 90% saw inflation-adjusted incomes continue to fall.
Source: Pavlina R Tcherneva.