Investors have spent much of 2026 treating resilient growth, artificial-intelligence spending and eventual monetary easing as compatible parts of the same bullish story, but renewed inflation pressure is making that combination harder to sustain.
Federal Reserve Chair Kevin Warsh’s Jackson Hole message has forced markets to reconsider an assumption that had become deeply embedded in asset prices: that the next important move in U.S. interest rates would be lower. Warsh instead emphasized that inflation remains too broad and too persistent for policymakers to declare victory. Nearly 54% of the components in the personal consumption expenditures basket rose more than 3% over the past year, according to figures he highlighted, a level far above the pre-pandemic norm.
The immediate market response matters because it changes the discount-rate calculation beneath almost every major asset class. Traders have moved toward pricing roughly a 60% probability of a Federal Reserve rate increase in September, while the two-year Treasury yield has remained above 4.3% and the 10-year yield near 4.7%. Those levels do not represent financial stress by themselves. They do, however, challenge an equity market that has become increasingly dependent on high future earnings growth and abundant capital.
That challenge is especially important for technology.
Nvidia (NVDA) recently delivered another powerful earnings performance, reinforcing the argument that artificial intelligence is producing real revenue rather than merely speculative enthusiasm. Yet the stronger the AI investment cycle becomes, the more capital it consumes. Data centers require semiconductors, power generation, transmission infrastructure, cooling systems, networking equipment and increasingly large financing commitments. The bull case remains credible, but the cost of funding that expansion now deserves almost as much attention as the growth it produces.
Investors should distinguish between believing in AI and believing that every AI-linked asset deserves a premium valuation regardless of interest rates.
For years, low or falling bond yields rewarded companies whose largest profits were expected far into the future. When risk-free yields rise, those distant cash flows become less valuable in present terms. A company can continue producing excellent results while its stock becomes less attractive simply because the alternative return available in government bonds has improved.
That is why the latest shift in monetary expectations matters more than another quarter of strong semiconductor demand.
There is a second complication: energy.
Brent crude has climbed back around $90 a barrel as renewed U.S.-Iran hostilities raise the risk of disruptions around the Strait of Hormuz. Oil at those levels does not automatically create another inflation crisis, but it does make the Federal Reserve’s job harder. Higher fuel and transportation costs can feed into household inflation expectations, corporate margins and eventually service prices, particularly if the increase persists.
Energy producers such as Exxon Mobil (XOM) may benefit from higher crude prices, but what is positive for the energy sector can be negative for the broader index. Airlines, manufacturers, chemical companies, logistics operators and consumers ultimately absorb some portion of higher fuel costs. The result is an uncomfortable combination for equities: higher input prices and a central bank with less freedom to offset weaker growth.
Markets have not completely ignored these risks. The momentum trade that rewarded investors for repeatedly buying recent winners has weakened sharply since July. The S&P 500 Momentum Index has fallen more than 9% since the beginning of that month even as the broader S&P 500 advanced, suggesting that leadership beneath the surface is becoming less stable.
That rotation is not necessarily bearish. It may instead represent a healthier market adapting to a different economic regime.
The important question for investors is whether corporate earnings can keep rising fast enough to outrun the higher cost of capital. If they can, equities can continue advancing even with Treasury yields near current levels. If earnings expectations flatten while bond yields remain elevated, valuations will become substantially harder to defend.
The distinction will increasingly separate sectors.
Companies with strong balance sheets, high current cash generation and pricing power should be better positioned than businesses whose valuations depend heavily on profits several years away. Financials could benefit selectively from higher rates if credit losses remain controlled. Energy companies could retain support if geopolitical risks keep crude elevated. Highly leveraged companies, speculative technology names and rate-sensitive real estate businesses would face a more difficult environment.
Even the largest technology platforms deserve closer scrutiny. Their cash balances remain formidable, but the AI investment cycle is transforming several formerly asset-light businesses into increasingly capital-intensive enterprises. Capital expenditures across the largest technology companies are expanding rapidly as they compete to secure computing capacity and energy infrastructure. Investors accustomed to valuing these businesses primarily on software-like economics may eventually need to account for something closer to infrastructure economics as well.
None of this means a September rate increase is inevitable. The Fed will receive important employment and inflation readings before its next decision, and weaker labor data could alter the calculus quickly. Markets are already preparing for Friday’s U.S. employment report after recent signs of cooling in hiring.
But the larger lesson does not depend on one Federal Reserve meeting.
The era in which investors could assume that every economic slowdown would quickly produce cheaper money has become less reliable. Inflation has proved persistent, commodity shocks remain possible, government borrowing needs are large, and technology investment itself is generating extraordinary demand for physical capital.
For equities, that does not end the bull case. It changes its requirements.
Future gains will need to be supported less by falling discount rates and more by actual productivity, earnings growth and cash generation. Nvidia and other AI leaders may continue delivering those results. Energy companies may benefit from scarcity and geopolitical risk. Other sectors may find that the hurdle rate has simply risen.
The most dangerous assumption in today’s market is not that stocks are expensive or that interest rates are high. It is the belief that strong growth, expensive energy, premium valuations and easy monetary policy can all persist together.
Something eventually has to give.
