Trumpflation Broadens Beyond Fuel, Threatening US Economy

Inflation linked to President Donald Trump's tariffs and the Iran conflict has become more deeply embedded. Data indicates core inflation remained around 3.3% through the summer while overall prices declined sharply.

The divergence between falling headline prices and persistent core inflation tells the real story. It suggests Trumpflation has moved past the fuel sector and become entrenched across the broader US economy.

Inflation Problem on Two Fronts From Trumpflation

President Trump brought back tariffs in July under Section 301 of the Trade Act, a few months after a loss at the Supreme Court. Companies have passed the higher costs of imported inputs onto consumers.

Iran shut the Strait of Hormuz in late February, halting approximately 20 million barrels of oil transit each day. That represents roughly one-fifth of global crude output.

Diesel reached a record $6.50 per gallon in September, based on figures from Barchart. Around one-third of the world's fertilizer also passes through the strait, pushing up food costs.

JUST IN 🚨: Diesel hits $6.50/gallon for the first time in history 📈 📈 pic.twitter.com/xBSpi6hYcW

— Barchart (@Barchart) September 21, 2026

This persistence is visible in the Core Personal Consumption Expenditures (PCE) index, the Federal Reserve's favored inflation measure. That gauge strips out fluctuating food and energy prices.

Macro strategist Jim Bianco has noted that core PCE has remained above the Fed's 2% goal for 65 consecutive months. He contends this streak indicates markets are overlooking the larger narrative by fixating on oil.

Market Implications of Trumpflation

Kevin Warsh's Federal Open Market Committee (FOMC) nonetheless raised interest rates by 25 basis points on September 16. Persistent inflation typically requires an extended series of rate increases to reverse, not just a single move.

This poses a challenge for a stock market trading at its most expensive level since the dot-com era. The metric used is the Shiller price-to-earnings ratio. The AI-led surge on Wall Street has largely factored in consistent rate relief ahead.

If Trumpflation continues to push the Fed into action instead, that bet could unravel. Investors counting on cheaper money may need to reconsider how long the rally can last. Whether Warsh's Fed shares that view could become clear at its next meeting.