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DIARY OF A CEO · Jun 25, 2026

Billionaire's WARNING: I'm SELLING. The Crash Is Already Here!

🎙 Steven Bartlett · Jeremy Grantham
31 claims12 predictions31 facts6 notable quotes raw JSON ↗

In this Diary of a CEO interview, 87-year-old investor Jeremy Grantham argues that AI has created the biggest investment bubble in history and warns that a major crash — potentially a 70% decline in the high-flying stocks — is imminent and could play out over the coming years. He advises selling US stocks and especially US tech, moving instead into non-US equities, bonds, cash and precious metals, and dismisses crypto as worthless. Grantham critiques SpaceX and Elon Musk as textbook market-peak euphoria, describes the Magnificent Seven as locked in a brutal winner-take-all AI war, and raises alarm about AI safety. He also links the market bubble to deeper crises: extreme wealth inequality, a dissolving US social contract, and a 'baby bust' in which toxic chemicals are driving a collapse in sperm counts and fertility. He closes by urging listeners to read the data, exit the most dangerous part of the market now, and brace for tougher times.

SEGMENTS

1:43
AI as the biggest investment bubble in history

Grantham argues AI is a transformative idea on the order of the railroads and the internet — which is precisely why it has formed the biggest investment bubble ever, due for a major bust.

12:14
What a crash looks like and how to position

Historical busts (1929, the Nifty 50 in 1972, Japan 1989), the possibility of a 70% decline in the high flyers, and Grantham's diversification playbook of bonds, cash, precious metals and real estate.

19:09
Why to avoid US equities and why advisors won't warn you

US stocks are dangerously overpriced; big firms never tell clients to exit because of career risk, illustrated by Grantham's 1998-99 Society of Analysts debate story.

28:00
Market psychology and the inefficient market

Markets are a behavioral jungle driven by momentum and extrapolation of current conditions, not efficient pricing (citing Keynes).

29:20
AI risk: benevolence, the paperclip problem, judgmental models

There is no consensus on AI; the debate over building in benevolence, Hinton's mother/baby analogy, the paperclip thought experiment, and Bartlett's anecdote about a moralizing Claude.

36:42
The Magnificent Seven and the winner-take-all AI war

Seven former monopolies are now fighting one brutal AI battle with likely only a single survivor, a sharp break from their previously separate, well-behaved monopolies.

43:47
SpaceX, Musk, and Mars as bubble euphoria

Grantham calls SpaceX a textbook market-peak 'BS story,' critiques Musk's stock-talking playbook at Tesla, and dismisses Mars colonization as fantasy.

52:18
Inequality, civilization unraveling, and where to live

Extreme wealth inequality, the dissolving US social contract, maternal-mortality gaps versus Europe, and Grantham's case for considering leaving the US.

1:05:36
The baby bust: sperm-count collapse and toxicity

Falling fertility driven by plastics, endocrine disruptors and pesticides; sperm count on track to near zero by 2045; calls to detoxify the environment and treat 2.1 children as a commons.

1:41:01
Closing: get out now, no help is coming

Grantham's book, his call to look at the data and exit the most dangerous part of the market yourself, and a warning of a record-hot year ahead.

NOTABLE QUOTES

“And now we're in the biggest investment bubble that arguably has ever occurred, AI.”
Jeremy Grantham · 1:43 — The episode's headline thesis in one line.
“the only people who think you can have compound growth on a finite planet are madmen and economists”
Jeremy Grantham · 3:56 — Captures his finite-planet, anti-extrapolation worldview (quoting Kenneth Boulding).
“It's the classic description of a market peak. It's what you look for at the top of a terrific bubble.”
Jeremy Grantham · 46:11 — His vivid diagnosis of SpaceX-style euphoria as a top signal.
“It's an unnecessary piece of nonsense that facilitates nothing except criminals moving money”
Jeremy Grantham · 1:21 — Blunt, memorable dismissal of crypto.
“I think the simple appeal would be to get your tail into the AI and try and be a leader.”
Jeremy Grantham · 59:18 — The paradox of the episode — short the bubble, yet ride AI to get rich.
“Have the courage to look at that, make your own conclusion, get out of the most dangerous part, and do it now. Don't wait for help because no help is coming.”
Jeremy Grantham · 1:43:46 — His closing call to action to retail investors.

PREDICTIONS ON THE RECORD

Dated and falsifiable — full record at /api/episode/<id>.

Jeremy Grantham · next few years · 2:15
The AI/market bubble will peak and collapse — possibly within days, weeks or months, but certainly within the next few years.
“The next few days, the next few weeks, the next few months, but certainly the next few years.”
Jeremy Grantham · unspecified · 10:32
From these unprecedented levels, a 70% decline in the high-flying stocks would not be unexpected.
“From these unprecedented levels, a 70% decline would not be unexpected.”
Jeremy Grantham · 5-10 years · 19:44
US equities may not be intact in 5 to 10 years because they are so badly overpriced.
“I'm not confident that US equities will be intact in 5 years, 10 years.”
Jeremy Grantham · unspecified · 18:38
House prices could come down about 30%, though they would still remain very expensive by historical standards.
“Even if they come down 30%, they're really still very expensive, aren't they?”
Jeremy Grantham · distant future · 1:04:14
Bitcoin will certainly go to zero in the distant future, though it may take a long time.
“in the distant future, yes, it will certainly go to zero, but it may take a long time.”
Jeremy Grantham · unspecified · 44:41
SpaceX will fail to deliver anything like its prospectus promises.
“I think it will fail to deliver anything like its promises in the prospectus.”
Jeremy Grantham · 20-25 years · 1:11:52
Within 20 to 25 years, the average young couple will need medical help to get pregnant.
“in 20 to 25 years, the average young couple will need help getting pregnant.”
Shanna Swan · by 2045 · 1:13:53
If the current rate of decline continues unchecked, the median male sperm count is on track to hit zero by 2045.
“if the current rate of decline continues unchecked, the medium male sperm count is on track to hit zero by 2045”
Jeremy Grantham · in 50 years (~2076) · 1:22:05
Within 50 years the life-expectancy gap between the US and Sweden will widen to eight or ten years.
“my estate would be willing to bet you that in 50 years, it will be eight or 10”
Jeremy Grantham · unspecified · 1:05:03
Population will decline as family formations fall in many richer countries.
“And by the way, the population is going to decline.”
Jeremy Grantham · by end of 2026 · 1:45:07
By around the end of this year his foundation will have written checks totaling a billion dollars to the climate change cause.
“some time around the end of this year, we will actually have written checks for a billion dollars to the climate change world.”
Jeremy Grantham · next 12 months · 1:45:32
The coming 12 months could be the hottest ever recorded, with severe droughts and heat starting now.
“We could have from now on the hottest 12 months from now to this time next year that we have ever had in history”

WHO CLAIMED WHAT

Every position taken in the episode, attributed to its holder, with conviction (0–1) and the verbatim receipt.

Jeremy Grantham — 30 claims

opinionconviction 0.851:02
Ordinary investors should not own US stocks — it is a simple strategy you can act on.
“Don't own US stocks. That's a simple strategy that you can act on.”
opinionconviction 0.851:08
Anyone with a big position in US technology stocks should sell them all.
“if you have a big position in US technology stocks, my personal advice would be to sell them all.”
assertionconviction 0.81:43
AI is the biggest investment bubble that has arguably ever occurred.
“And now we're in the biggest investment bubble that arguably has ever occurred, AI.”
opinionconviction 0.85:24
AI is a genuinely transformative idea on par with the railroads — which is exactly why it forms a bubble.
“I think artificial intelligence is right up there with the railroads. It's one of the defining great ideas of the last couple of hundred years.”
assertionconviction 0.85:24
The greater and more obvious the idea, the more money pours in, and the bigger the bubble and the bust.
“The greater the idea, the more obvious the idea, the more money goes in, and the bigger the bubble, and the bigger the bust.”
opinionconviction 0.83:56
Endless compound growth on a finite planet is impossible.
“the only people who think you can have compound growth on a finite planet are madmen and economists”
assertionconviction 0.8520:36
Investment advisors and big firms will never tell you to get out of an overpriced market, because doing so is bad for business.
“you will not receive the advice from investment advisors to get your tail out of the market ever.”
opinionconviction 0.851:01:59
The stock market is not efficient — prices are psychology and the extrapolation of today's conditions.
“The stock market is not efficient. The stock market extrapolates today's conditions.”
opinionconviction 0.713:50
Rule number one is to always be diversified — hold wholesome bonds, cash and a small amount of precious metals.
“rule number one is always be diversified.”
opinionconviction 0.751:01:02
The average investor should put ~60% in a broad non-US equity index, 5-10% in precious metals, and the rest in bonds and some real estate.
“For 60% of your money and then 5% or 10% in precious metals.”
opinionconviction 0.91:03:34
Crypto is worthless nonsense that facilitates nothing except criminals moving money and is not a store of value.
“I think it's an unnecessary piece of nonsense. It facilitates nothing except criminals moving money, so they can't be seen.”
opinionconviction 0.71:04:43
Buying a house now is hard to justify given record-high prices, political resistance and a coming population decline that removes bidders.
“It's hard to imagine how it could be a good decision when there's such an increasing fraction of people who can't afford it.”
opinionconviction 0.846:11
SpaceX's soaring valuation is a textbook market-peak euphoria signal.
“It's the classic description of a market peak. It's what you look for at the top of a terrific bubble.”
opinionconviction 0.743:47
One should actually hope SpaceX fails, because its success would mean dangerously rapid AI, robotics and energy expansion.
“One of the scary things about SpaceX is you should wish that it not work out.”
opinionconviction 0.7546:11
Musk's Tesla success came from talking the stock far above its worth in a self-fulfilling prophecy, which he cannot repeat with SpaceX.
“He's so good at BS, that's a technical term, that he tore the stock up to four or five times what it was worth on paper.”
opinionconviction 0.849:00
Colonizing Mars is essentially fantasy and not viable for the human body.
“Going to Mars is not within the laws of physics, really.”
assertionconviction 0.838:03
The Magnificent Seven have lost their separate monopolies and are now in a brutal winner-take-all AI war with likely one survivor.
“There'll only be one survivor, they think. Everything goes to the one who gets there first.”
opinionconviction 0.7530:58
Pushing ahead on AI without first carefully building in benevolent behavior is extremely risky.
“We're just pushing ahead and that is going to be extremely risky, isn't it?”
assertionconviction 0.729:27
A higher intelligence has essentially never been sustainably benevolent to a lower one, with the lone example of mothers to babies.
“when was there ever a case where a higher intelligence was benevolent in a sustainable way to a lower intelligence?”
opinionconviction 0.7553:23
Wealth inequality is the biggest economic problem.
“I think that's the biggest economic problem.”
opinionconviction 0.656:41
Extreme inequality historically resets only through catastrophe, and a war that forces shared sacrifice is preferable to civil collapse.
“In the end, it's better to have a war and have everyone pull their weight and work together, than it is the other.”
opinionconviction 0.757:01
The remedy for inequality is to gradually tax the rich more and help the poor, shifting the tax curve steeper as in 1935-75.
“shift the tax structure in favor of a slightly steeper curve.”
opinionconviction 0.727:29
Founders should lock up as much capital as possible now and brace for impending problems.
“Just brace yourself for impending problems, which is a pretty good principle anytime, but it is a better principle than normal today.”
opinionconviction 0.759:18
To get rich today, get into AI, take lots of risk, and work hard.
“I think the simple appeal would be to get your tail into the AI and try and be a leader.”
opinionconviction 0.71:34:30
Ordinary people should brace for tougher times ahead and acquire useful, practical (mechanical, engineering, science) skills.
“I think they have to brace themselves for tougher times ahead than they would have expected.”
assertionconviction 0.81:17:01
The fertility and sperm-count decline is driven by toxic chemicals — plastics, endocrine disruptors and pesticides delivered into the body.
“Because pesticides are full of these toxins, and they are delivered straight into your body.”
opinionconviction 0.81:22:05
The US is far more toxic than the EU because it puts corporations first, and it must start banning these chemicals.
“If the US wants to put the corporations first, they will have shorter lives.”
opinionconviction 0.651:27:55
If pregnant women avoided cosmetics and ate organic, as much as half of the fertility/toxicity harm would disappear.
“I think as much as half of all the trouble disappears.”
opinionconviction 0.71:31:28
Society must treat raising 2.1 healthy, well-educated children as a shared commons and detoxify capitalism to support families.
“we have to end up with a society that realizes that 2.1 healthy, well-educated children is a part of the commons.”
opinionconviction 0.751:36:18
The US social contract is dissolving, making it a worse place to live than countries like Denmark, Japan, Sweden or Germany.
“It holds out too much chance that the social contract is dissolving.”

Steven Bartlett — 1 claim

predictionconviction 0.634:10
Overly moralizing, judgmental AI models like Claude will lose users and be forced to remove those restrictions to compete.
“any model that does that will be a losing model. And I'll go to somewhere else.”

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