The Rational Reminder Podcast: Episode 390: The "AI Bubble" and Stock Market Concentration (opens in new tab)

In this first episode of 2026, we sit down for a deep dive into one of the hottest concerns coming from clients and listeners lately: Is the U.S. stock market dangerously concentrated—and are we in an AI bubble? Ben, Dan, and Ben unpack the data, the history, and the psychology behind today’s valuations, drawing lessons from past episodes of market euphoria such as Nortel in Canada, the dot-com boom, and Japan’s 1989 peak. They explain why high market valuations—not concentration—pose the big...