Fed's K-shaped economy dilemma splits policy path in 2 directions

The U.S. economy is splitting along income lines — and the Federal Reserve's traditional tools can't fix it.

The Federal Reserve faces a structural policy dilemma as the U.S. economy fractures along income lines, with high-income households driving consumption while lower-income groups struggle under rent and debt burdens, according to a June 29 report from BofA Securities.

"The Fed's monetary policy is both partly responsible for the K-shaped divergence and unable to directly repair it," said Shruti Mishra and Aditya Bhave, economists at BofA Securities. "Gradualism is the most prudent approach given the conflicting signals of reflation among the wealthy and mild stagflation among lower-income groups."

The data underscores the divide. The top 10% of households by income account for about 23% of total U.S. consumption, while the bottom 10% contribute just 4%, according to Bureau of Labor Statistics consumer expenditure data. Low-income households spend 63% of their budgets on necessities such as energy, groceries, housing and healthcare, compared with 31% for the top decile, whose discretionary services spending reaches 43.5%. This structural gap means energy price shocks — amplified by the Iran conflict — hit lower-income households far harder, functioning as a regressive tax.

The K-shaped dynamic helps explain a puzzle that has confounded markets: why consumer spending has remained resilient even as the labor market cools. Since aggregate consumption is dominated by high-income households benefiting from equity wealth effects and pandemic-era fixed-rate mortgages, overall spending has held up. Meanwhile, job market weakness has been partly concentrated among immigrant populations with limited consumption weight, widening the divergence between employment data and spending figures.

The Fed's tightening cycle has reinforced the split through two channels. Credit card rates rose sharply with the federal funds rate — Boston Fed research shows each 1-percentage-point increase in credit card APRs reduces overall spending by about 9% the following month, with the impact on low-credit-score consumers roughly double that on high-score borrowers. Separately, rent inflation surged during the tightening cycle while homeowners locked into low fixed-rate mortgages saw housing costs remain stable, disproportionately burdening lower-income renters.

The current policy rate stands at 3.50% to 3.75%, after 350 basis points of cumulative hikes since March 2022 and subsequent cuts in 2024 and 2025. Inflation is hovering around 4%, double the Fed's 2% target, with half of the 18 Federal Open Market Committee members projecting rate hikes this year, according to their June projections. Chair Kevin Warsh has reduced forward guidance in favor of a more data-dependent approach — a shift IMF Chief Economist Pierre-Olivier Gourinchas called "entirely appropriate" given that rigid guidance proved costly when inflation surged.

The policy calibration challenge is acute. If the Fed focuses on aggregate data dominated by high-income spending, it risks maintaining an overly tight stance that could eventually crack the low-income consumer base. If it eases prematurely, it could reignite inflation among asset-owning households. The San Francisco Fed's Policy Calibration Tool illustrates the range of possible outcomes: under a cost-push tariff scenario, the tool prescribes rate hikes to fight inflation; under a weak-demand scenario driven by uncertainty, it prescribes cuts.

Fiscal policy offers limited relief. The U.S. fiscal deficit is running above 6% of GDP, with tariff refunds of about $175 billion, potential defense supplemental spending of roughly $100 billion, and recent immigration-related appropriations consuming available capacity. Additional fiscal stimulus risks pushing up long-end yields, tightening financial conditions for the very households policy aims to protect, while also fueling demand-driven inflation.

There are tentative signs of improvement. BofA's June card data shows the consumption gap between high- and low-income households narrowing in the first half of the month, and the bank's research institute reports rising after-tax wage growth for middle- and lower-income workers. If sustained, this could signal that job growth is broadening into blue-collar sectors such as leisure, hospitality, construction and manufacturing — a pattern that preceded the K-shaped divergence.

The next FOMC meeting will test whether the data-dependent approach Warsh has embraced can navigate the cross-currents. Markets are pricing a divided committee, with the outcome hinging on whether inflation data or labor market weakness takes precedence in the policy calculus.

This article is for informational purposes only and does not constitute investment advice.