The Stock Market Has Done This Just Twice in 156 Years. Now It's Happening Again.

In the past 156 years, the stock market has experienced a similar situation twice before, with periods of unusually high stock valuations followed by significant market downturns. Currently, the S&P 500 has reached a cyclically adjusted price-to-earnings (CAPE) ratio of 40.71, one of the highest readings in history. This high CAPE ratio suggests that the market is extremely expensive compared to what companies have earned over the past decade.

The last time the CAPE ratio was this high was during the dot-com bubble, which ultimately led to one of the worst downturns in recent history. This situation isn't entirely new, as a similar scenario occurred in 1929 when the CAPE reached a record high shortly before the stock market crashed, marking the start of the Great Depression.

While the current AI-driven bull market has more solid companies than the speculative internet boom of the 90s, the parallels between the two are striking. History warns us that even promising technological revolutions don't guarantee a bull market will last forever. As investors, it's crucial to prepare for a potential downturn, even if today's bull market might be different, it's not immune to the risks that brought previous rallies to an end.