Core argument: Wealthy households’ rising share of consumer spending over 35 years is more certain than precise percentage estimates.
“I feel more confident in the historical trajectory than I do in the actual levels,” said Mark Zandi, keeper of the spreadsheet that churns out its quarterly consumer spending estimates. “I wouldn’t die on the hill of the top 10% accounting for 45% of the spending, but I would fight hard that the share that’s going to folks in the top 10%, top 20% has risen significantly and consistently over the past 30, 35 years.” The method Zandi uses to estimate consumer spending combines data on asset holdings by income from the Federal Reserve’s triennial Survey of Consumer Finances with data on asset flows from its quarterly Financial Accounts of the US. The idea to merge the two originally came from then Fed Chairman Alan Greenspan in the late 1990s.“My understanding is he actually sketched it out on a napkin on an airplane flight,” said economist Dean Maki, who along with his Fed colleague Michael Palumbo was charged with making Greenspan’s idea operational and using it, in 2001, to estimate the “wealth effect” on consumer spending during the 1990s stock market boom. “One thing I learned from doing that research back when I was at the Fed was that wealth effects are important,” said Maki, now chief economist at asset manager Point72. “They were an important driver of consumer spending then and they still are today.”The K-Shaped Economy’s Defining Statistic Has Some Problems
AI Summary. Consumer spending in the United States has become increasingly concentrated among the highest earners over the past three decades, driven by wealth effects — the tendency for rising asset values to boost spending among those who hold the most assets.
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Moody’s claim that the top 10% of Americans by income drove 45.8% of consumer spending in 2025 may be overstated. After taxes, the income share of the top 10% is only ~30–37%. But top earners also had big wealth gains, and “wealth effects are important.”
Takeaways by Macro Roundup® AI
- Wealthy households’ rising share of consumer spending over 35 years is more certain than precise percentage estimates.
- Asset price fluctuations significantly drive consumer spending patterns, making wealth effects critical to economic forecasting.
- Income inequality’s impact on spending concentration has grown consistently, reshaping the economy’s demand structure.


