Jeremy Grantham: Lessons from 60 Legendary Years of Investing

ELI5/TLDR

Jeremy Grantham, 87, has been calling bubbles for six decades. He says the current US market is one of the two or three most expensive in business history, and the world it sits inside — climate, demographics, geopolitics, trade war, actual war — is one of the more dangerous ones. He doesn’t predict crashes, he just waits for the obvious to arrive and then names it. The discipline is unfashionable. He wears that.

The Full Story

Not market-timing, just refusing to stand still

Grantham objects to the framing of “predicting” bubbles. He says he just notices when they have arrived. Same with timing — he calls the disparaging label a way buy-and-hold investors dismiss anyone who uses their brain.

“I don’t think of it as timing the market. I think of it as getting out of clearly overpriced stocks and concentrating always on the ones that are cheap.”

His view: if you keep buying cheap and selling dear, in the long run you win. In the meantime, other people will outperform you, and you have to be willing to take that on the chin.

The butterfly mind

He attributes a lot of his thinking style to wandering. Don’t grind on a problem. Drift around the edges, come back, drift again — like a butterfly in a garden, returning to the same flowers without ever sitting still on one.

“Very hard work does get in the way of thinking because you’re so busy shoveling in new data. You have little time to really think.”

The good ideas, he says, arrived on the walk across Boston Common before he reached the office. He’d show up with two or three. Most were silly. The trick was having a colleague — Chris Darnell — who could destroy a bad idea in twenty seconds. One out of ten or twenty would survive into research. One or two good ideas a year, he says, are enough.

The dividend discount model as ruler, not religion

GMO’s core was a dividend discount model — every stock got a fair-value ratio. 0.79 meant 21% cheap. 1.12 meant 12% expensive. Sum them by category and the picture emerged: small caps cheap, mega caps expensive, etc. It wasn’t an idea. It was a measuring stick to test whether instinct was right.

He has a sneaking respect for momentum, even though it shouldn’t work. “A body in motion tends to stay in motion for a while.” But he thinks the deepest free lunch was always quality — less debt, higher returns, fewer bankruptcies. By every theory, AAA stocks should underperform like AAA bonds. Instead they outperform by half a percent. That’s roughly 1.5% of inefficiency that the academics ignored for decades.

The pain of being early

Real outperformance, he argues, requires a willingness to bleed first. Three-sigma bubbles don’t appear out of nowhere — they pass through the merely ridiculous on their way to the cosmically ridiculous.

“If you want to make real money, you have to go from overpriced to very overpriced to oh my god, extremely overpriced. And from that point, you make a fortune. But by that point, you have taken a lot of grief.”

He notes that in 2000 there were many places to hide — REITs at discounts to NAV, value stocks as cheap as 1974, inflation-linked bonds yielding 4%. GMO portfolios went up over the three years the S&P fell 50%. 2007 was different — a risk bubble where everything risky was overpriced and there was nowhere to hide.

This one, he says, is more like 2000. The rest of the world’s equity markets — Europe, emerging, Australia, Canada — looked extremely reasonable at the start of the year. The US was the problem.

The PE-as-prophet myth, inverted

Bull markets always claim the future must be bright — otherwise prices wouldn’t be this high. Grantham says the historical record is precisely the opposite. The terrible decades follow the great bubbles, not random distributions. The Great Depression follows 1929. Japan’s lost twenty years follow 65x earnings in 1989.

“There’s no example of a high PE predicting higher profits, higher growth, higher productivity in history. What they do predict is tough times.”

His list of present headwinds: tariffs unwinding postwar trade gains, Russia/China geopolitics simultaneously hostile, climate damage now visible enough to maybe shave half a point off global GDP, populations declining outright in Japan, South Korea, China.

Why no one on Wall Street will tell you to sell

This part is worth marking. Grantham points out that no major bank — Goldman, JPM, Morgan Stanley — will ever tell clients to get out of a market they themselves can see is dreadfully overpriced. It is not their business model. The corporate strategy is to keep clients dancing until the cliff and then make money cleaning up.

“Dear viewer, do not think because no one serious is telling you to sell out that this means the market is reasonably priced. It simply does not.”

The feather analogy

Stand on a high-rise in Miami in a hurricane and throw a bag of feathers. Some land in 30 seconds, some end up in Maine eight days later. But every single feather hits the ground. You know nothing about the short term and everything about the long term. Value, for Grantham, is the gravitational equivalent.

What’s different this time: the AI distortion

Grantham flags one feature of this cycle that doesn’t fit his historical patterns. In 2022, the speculative junk rolled over hard — meme stocks, no-earnings names — and he wrote “Let The Wild Rumpus Begin,” only the second timing call of his career. The S&P duly fell 25%, MAG 7 down 40%, growth down 35%.

Then ChatGPT arrived. The MAG 7 got so big that they pulled the S&P back up by themselves, even as the rest of the market continued to drift down for ten more months. He compares it to the railroads being discovered in the middle of 1930 — a real economic force big enough to disrupt the normal cyclical patterns.

“Without that my guess is we might very well have tipped into a mild or moderate recession… and the market instead of stopping down 25% the S&P would probably have gone down maybe 40 or more and we’d had a real bare market.”

He’s also wary of the fact that the MAG 7 are quality companies, not junk — which scrambles his usual signal where blue chips lead while flakes get hammered at the top. But he thinks the pattern of MAG 7 weakening while breadth picks up is probably more right than wrong. He invokes Chuck Prince: as long as the music’s playing you have to dance, but you might choose to dance with Coca-Cola rather than Pumatech, because come the end you’d rather not be holding the latter.

The 2009 call

In March 2009, GMO published “Reinvesting When Terrified.” He’d sent it to the Wall Street Journal, who didn’t read it in time. When he published it himself, it marked the bottom essentially to the day. The S&P was at 666 and is now up more than 10x.

“The market does not turn when it sees light at the end of the tunnel. It turns when all looks black, but just a subtle shade less black than the day before.”

He didn’t try to nail the absolute bottom. His seven-year forecast had jumped to 12% real returns — the highest in 22 years on his model. Cheap enough. Don’t wait for cosmic.

Eisenhower

Closing notes go to Eisenhower’s farewell speech — not the famous military-industrial-complex line, but the line about not plundering for our own ease and convenience the precious resources of tomorrow. Grantham says no president before or after has come even close to that sober a comment on living within our means.

Key Takeaways

Current US equity market sits in the top two or three valuations in history, against one of the more hostile macro backdrops in a century.
Outside the US — Europe, EM, Australia, Canada — looks reasonable. Plenty of places to hide, similar to 2000.
Quality has historically been a free 1-1.5% per year. The academics ignored it for decades.
High PEs do not predict high future growth. They predict the bad decade that follows.
Wall Street will never tell you the market is overpriced. The business model forbids it.
AI is a real economic force on the railroad scale and may have prevented a 2022-23 bear market by pulling the index up while breadth weakened.
The current “broadening” rally with MAG 7 weakening is, on his historical pattern, a late-stage tell — not a bullish breadth signal.
Bottoms turn on “less black than yesterday,” not on visible light.

Claude’s Take

Grantham at 87 is more useful than half the active managers running money today. He has an unusual combination — a historical-pattern obsession, a measurement framework that humbled the instinct, and the temperamental ability to be wrong for years and not adjust. That third one is what nobody can copy.

The honest part of this interview is the AI caveat. He doesn’t try to fold AI into his model — he openly says it scrambles the signal because the MAG 7 aren’t junk, and he admits a single technological force big enough to delay the cycle is something his framework hasn’t had to cope with before. The 1930-railroad analogy is the right one. It’s the kind of intellectual concession most permabears never make.

Where I’d push back: Grantham has been bearish on the US for most of the last decade and the cost of listening to him in real time has been enormous. The “you win in the long run” frame is mathematically true and behaviorally almost impossible to live. His own admission — eight or nine percent of outperformance for nine straight years versus Buffett’s 9% across 60 — is telling. Calling tops is a different skill than compounding through them.

Score: 8/10. Not because the views are novel — much of this is in his quarterlies — but because the texture is good. The Chris Darnell story about killing ideas in 20 seconds, the butterfly metaphor, the Chuck Prince update, the AI-as-railroad framing, the “feathers fall but you don’t know which one lands where” image. Worth the hour for the way he thinks, not just what he thinks.