More Americans have moved into upper-middle-class incomes over the past several decades (source paywalled; alternative source), with new research suggesting that group has grown sharply while the lower and core middle class have shrunk. The Wall Street Journal reports: In 2024, about 31% of Americans were part of the upper middle class, up from about 10% in 1979, according to a report released this year by the right-leaning American Enterprise Institute. There is no single, standard definition of middle class, or upper middle class, and what counts as a hefty income in one city can feel paltry in another. The AEI report, by Stephen Rose and Scott Winship, classified a family of three earning $133,000 to $400,000 in 2024 dollars as upper middle class. Households earning more were categorized as rich. The analysis looked just at incomes, not assets such as stocks or real estate.

[...] The gains span generations. Many baby boomers, born to parents who grew up in the Great Depression, are living well on their savings, aided by steady Social Security checks and decades of stock-portfolio gains that they can now tap. Millennials, who everyone worried would be permanently set back by the 2008-09 financial crisis, are earning solid incomes, buying homes and surpassing their parents. Many families are surprised to find that they have moved into this new economic tier, and see themselves as comfortable, not rich. They tend to have jobs that are white collar but not flashy -- think accountants, not tech founders.

This doesn't mean that all Americans are climbing the ladder. Entrenched inflation and higher prices on major necessities have pushed many families closer to the financial edge, or locked them out of homeownership. Those costs weigh on high-earning families too, and for many are the reason they don't feel wealthy. The AEI report divided families into five different groups by income. Three groups were in the middle: lower middle class, core middle class and upper middle class. The authors found that more families now fall into the two highest-earning groups -- upper middle class and rich -- and fewer fall into the three lower-earning categories.

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