Financial FAQs
“How errors of human judgment can infect even the smartest people, thanks to overconfidence, lack of attention to details, and excessive trust in the judgments of others, stemming from a failure to understand that others are not making independent judgments but are themselves following still others—the blind leading the blind.” Robert Shiller, Irrational Exuberance
Both the DOW and S&P 500 indexes of the largest publicly traded companies in the U.S. are at record levels, despite Donald Trump having just raised tariffs on 90 countries that he doesn’t like for some reason. April 2 was the last time he made such an announcement and the S&P plunged 828 pts. on the same day (see dip in graph), and the DOW more than 1,000 pts. before resuming their climb.
Yet the financial markets aren’t panicking this time, maybe for the wrong reasons. Their over enthusiasm, which was first termed irrational exuberance by Fed Chair Alan Greenspan in the mid-1990s as a warning that stocks were overpriced, has created a new asset bubble much like the dot-com asset bubble, and housing bubble that led to the Great Recession.
And such massive overinvestment in new technologies such as the current AI investment boom haven’t turned out well, historically.
Nobel Laureate Robert Shiller first wrote about it in his 2000 book, Irrational Exuberance, just before the bursting of the dot-com speculative bubble, which was precipitated by overinvestment in communication technologies such as the nationwide laying of fiber optic cables.
He said at the time: “I define a speculative bubble as a situation in which news of price increases spurs investor enthusiasm, which spreads by psychological contagion from person to person, in the process amplifying stories that might justify the price increases, and bringing in a larger and larger class of investors who, despite doubts about the real value of an investment, are drawn to it partly by envy of others' successes and partly through a gamblers' excitement.”
Companies are investing $trillions in developing AI, which is powering the largest Magnificent 7 tech stocks such as Apple and Facebook to record highs. Market analysts on CNBC have noted that ten stocks are driving 40 percent of the market’s current rally.
Yet just 9.4% of U.S. businesses used AI in July, including machine learning, natural language processing, virtual agents, and voice recognition, according to the Census Bureau as cited by Barron’s Megan Leonhardt.
S&P members’ current earnings per share reflect this. Stock prices have climbed to 29 times earnings which, according to Professor Shiller’s research, is approaching irrational exuberance territory. This is double the S&P’s historical EPS average price of 15 times earnings over the past 100 years that Dr. Shiller has researched.
The markets seem to be ignoring Trump’s erratic behavior for other reasons as well. This is in part because of investors’ belief that inflation is mild, though still rising. The Fed’s favored PCE inflation index for June increased 2.6 percent. Excluding food and energy, the PCE price index increased 2.8 percent from one year ago, still above the Federal Reserve target inflation rate.
And the long-awaited interest rate cuts financial markets haven been hoping for could begin in September after the very weak July unemployment report that caused Trump to fire the BLS Director.
The markets are also ignoring the damage Trump’s higher tariffs will cause to economic growth. History has shown that stagflation is a recurring problem, even during the COVID-19 pandemic. Supply chains dried up then as the world economies shut down, elevating inflation. And supply deliveries have already slowed from the effects of Trump’s on-again, off-again executive orders, as countries look for ways to reroute their exports.
Maybe the greatest sign of irrational exuberance is investors’ assumption that TACO Trump will eventually settle tariffs back to the 10 to 15 percent rates that he initially promised. But when?
Trump and Republicans have always had a problem with the truth and economic facts (like who benefits most from tax cuts), as has been pointed out by those professionals whose job it is to ascertain the facts (with many losing their jobs because of it).
Irrational exuberance has seriously damaged financial markets in the past and caused $trillions in losses. It happens when investors ignore financial facts that aren’t convenient or follow the herd rather than make the effort to read below the headlines.
What will happen this time when market investors realize this administration doesn’t believe in the facts at all?
Harlan Green © 2025
Follow Harlan Green on Twitter: https://twitter.com/HarlanGreen
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