Subject: Re: OT Grantham Sounding AI Alarm
Why is Grantham called a "legendary investor?...

Grantham is highly respected for predicting both the 2000 dot-com collapse and the 2008 financial crisis.

Grantham famously anchors his investment thesis in a statistical framework.
He argues that all massive economic bubbles eventually fall back toward their historical trend, much like a rubber band stretching. (The Principle of Mean Reversion)

Grantham's two-sigma bubble framework shows all 26 prior historical bubbles reversed to trend without exception, pointing to a potential 70% peak-to-trough collapse.

He also highlights the market capitalization-to-GDP ratio ("The Buffett Indicator"), which sits at about 235%.
During the dot-com bubble peak in 1999, this same ratio approached 200%, a level Buffett said meant you were "playing with fire."

He argues that transformative ideas always attract too much money, creating bubbles that inevitably burst.
He pointed to SpaceX's blockbuster valuation as a symptom of this peak euphoria.
These factors have caused Mr. Grantham to currently conclude:
"The long-run prospects for the broad U.S. stock market here look as poor as almost any other time in history."

Maybe it is different this time, maybe we've reached a "permanently high plateau."
Maybe the market will never again return to trend, maybe Grantham is totally wrong.
Or maybe not...
Stay tuned!

"You never know who's swimming naked until the tide goes out." ~Warren Buffett

https://finance.yahoo.com/mark...

https://seekingalpha.com/news/...

https://www.cnbc.com/2026/06/2...