Abstract

Populists on both the political left and right routinely claim that the middle class has been hollowed out. These claims, to the extent they are based on evidence, rely on a relative definition of the middle class, such that if income doubles for every family, the middle class does not grow. Using an absolute definition of the middle class, we find that the “core” middle class has shrunk, but only because more families have become upper-middle class over time. The upper-middle class boomed from 10 percent of families in 1979 to 31 percent in 2024, and its share of income doubled. The share of families whose income left them short of the core middle class fell from 54 percent to 35 percent. Claims of a hollowed-out middle class wrongly reinterpret widespread (if unequal) gains across the income distribution as rising insecurity and declining living standards.