Wall Street Is Partying. Main Street Is Paying the Bill.

US stocks hit all-time highs this week as the S&P 500 closed Friday at 7,520 after a 5% monthly gain. The Nasdaq surged 8% in May to a new record close of 26,972, while the Dow Jones climbed 3% to 51,032. It was also a strong week for individual stocks, highlighted by a 19% single-session gain by Micron Technology, which crossed a $1 trillion market capitalization for the first time, becoming the latest company to join a club that includes Nvidia, Apple, and Microsoft.

That same week, the Bureau of Economic Analysis reported that the PCE price index rose 3.8% over the past year, the highest reading since May 2023. Core PCE, which excludes food and energy, rose 3.3%, more than double the Fed's 2% target. The market now prices a 40% probability of a rate hike by December, up from virtually nothing just three months ago.

A new record high for the S&P 500 in the same week as new high readings for the annual inflation rate. How can this be?

The Stock Market Is Not the Economy

The S&P 500 is comprised of the 500 largest publicly traded companies in the United States. The top 10 stocks in the index represent approximately 40% of its total weight. These companies generate large portions of their revenues from technology infrastructure globally, cloud computing, AI, and software, and as a result, their earnings do not correlate to the same extent as other industries to the current state of consumer spending in the United States. In fact, as evidenced by the Nasdaq versus Dow Jones Industrial Average gap this month, the index comprised primarily of technology companies rose 8% in May, whereas the DJIA, comprised of industrial companies including many retailers, rose just 3% in the same period.

This is the core of the disconnect. The S&P 500 at all-time highs tells you the stock market is doing extremely well. But the stock market is not the same thing as the economy. The top 10 companies account for over 40% of the index's value, which means the S&P 500 is really a reflection of the performance of a handful of very large technology-based companies. The Nasdaq is comprised almost entirely of chipmakers and software companies making their money from global technology infrastructure spending, from cloud computing, from AI, none of which necessarily relies on the health of the average American consumer.

What the Consumer Data Actually Shows

At the same time, the data on individual households is becoming more negative. Payment delays on credit cards have begun to rise. Bankruptcies have started to increase. Inflation is stripping away the purchasing power of wages that have gone up. The individual consumer, who drives roughly 70% of US GDP, is starting to feel the pinch, and none of this is reflected in the S&P 500, because more and more of the index is composed of companies that generate their revenues from large enterprise technology spending tied to AI, not from what households buy.

The Micron Story

The Micron story illustrates this most clearly. Micron makes memory chips used in computers and other devices to store information. When UBS tripled its price target for the stock, sending it up 19% in a single day, it was not because of anything related to current consumer demand. It was because of long-term agreements for memory chips destined for AI data centers expected to be built in the future. SK Hynix and Samsung have already crossed the trillion-dollar mark for the same reason. Memory chips are the new oil.

S&P 500 earnings are expected to grow more than 20% in 2026. That number has held up even as inflation climbed, because large corporations have the ability to pass higher costs on to customers, reduce their workforce if needed, and in the case of AI-adjacent firms, grow fast enough that costs become a secondary concern. Inflation usually hurts households more than large corporations, because big companies often have more ways to protect their profits.

Where This Could Break Down

There are real risks here. Historically, long-term interest rates and stock prices have tended to move in opposite directions, and right now long-term rates are at 19-year highs. The higher the risk-free rate, the more it reduces the present value of future earnings. For AI-driven companies to justify their current stock prices in a higher-rate environment, they will need to keep delivering exceptional earnings growth. That is not guaranteed.

The question remains whether AI-driven earnings growth can outrun the pull of higher interest rates. It has so far. But for how long?

The Bottom Line

A record for the S&P 500 is not indicative of a strong economy across the board. What we are witnessing is a number of large technology companies experiencing extraordinary gains fueled by AI infrastructure spending that has very little to do with the health of the average consumer. Meanwhile, inflation remains stubbornly high and, for the first time in years, a rate hike is back on the table. The Nasdaq's 8% gain in May versus the Dow's 3% illustrates the point: the more a market depends on real people spending real money, the less it is celebrating right now. An index of 500 stocks where 10 companies account for 40% of the weight is not measuring what most people think it is measuring.