The Diary Of A CEO
The Diary Of A CEO
June 25, 2026

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

YouTube · 32u5T6lO8qk

Quick Read

Jeremy Grantham, a legendary investor who managed $165 billion, warns that the biggest investment bubble in history is about to burst, advising against US stocks and highlighting a looming fertility crisis driven by environmental toxins.
Sell US stocks and diversify globally into non-US equities, bonds, cash, and precious metals.
The AI-driven market is an unprecedented bubble, poised for a 70%+ decline in "high-flyer" stocks.
A chronic baby bust due to environmental toxins threatens human reproduction, with average male sperm count projected to hit zero by 2045.

Summary

Jeremy Grantham, a renowned investor with 60 years of experience and $165 billion in peak AUM, asserts that the global economy is in the midst of the largest investment bubble in history, fueled by AI euphoria, and is on the verge of a significant collapse. He advises individual investors to sell US stocks, diversify into non-US equities, bonds, cash, and precious metals, and for founders to secure capital now. Grantham also highlights a severe, often-ignored fertility crisis, projecting average male sperm count to hit zero by 2045 due to endocrine-disrupting chemicals in plastics, pesticides, and cosmetics. He criticizes the US for its extreme wealth inequality and lax chemical regulations compared to Europe, leading to declining life expectancy and a dissolving social contract.
Grantham's warnings come from decades of successfully identifying and navigating market bubbles, offering a contrarian view to mainstream financial advice. His insights on the impending economic downturn and the silent environmental health crisis provide critical, actionable intelligence for both investors and individuals concerned about long-term societal well-being.

Takeaways

  • Don't own US stocks; they are badly overpriced and will underperform.
  • Sell US technology stocks, especially those tied to AI euphoria, as they are prone to significant declines.
  • Crypto is "unnecessary nonsense" that facilitates criminal activity, and Bitcoin will eventually go to zero.
  • The current AI boom represents the "biggest investment bubble in American history," similar to past bubbles like railroads and the internet.
  • Expect a 70% or more decline in "high-flyer" AI stocks during the impending market collapse.
  • Diversify investments into non-US equities (emerging markets, Europe, Japan, Canada, Australia), bonds, cash, and precious metals (gold/silver).
  • Founders should raise capital now and build conservatism, bracing for impending problems and a scarcity of investment.
  • Average male sperm count is projected to hit zero by 2045 due to widespread exposure to endocrine-disrupting chemicals.
  • The US has significantly laxer chemical regulations than Europe, contributing to declining life expectancy and public health issues.
  • The US social contract is dissolving, leading to higher maternal mortality rates and extreme wealth inequality.
  • Consider living outside the United States in countries with stronger social contracts and better public health outcomes.
  • Pregnant women should prioritize organic produce and avoid cosmetics to mitigate toxin exposure and protect fetal development.

Insights

1The 'Biggest Investment Bubble in History' is Poised to Burst

Grantham, with 60 years of investing experience, identifies the current AI-driven market as the largest investment bubble ever, comparable to the railroad and internet bubbles. He predicts a collapse, with 'high-flyer' stocks potentially declining by 70% or more, citing historical precedents like Amazon's 92% drop post-dot-com bubble and Japan's 20-year market stagnation after its 1989 peak.

Grantham states, 'This is, I think, the biggest investment bubble in American history.' He forecasts, 'a 70% decline would not be unexpected' for high-flyer stocks, recalling Nasdaq's 82% drop in the tech bubble and Japan's 20-year market decline post-1989.

2Investment Firms Have Misaligned Incentives During Bubbles

Grantham asserts that investment advisors will never tell clients to exit an overpriced market because it's 'bad business' and carries significant career risk. He recounts a 1999 debate where 99% of financial analysts privately believed a major bear market was coming, yet their firms publicly maintained optimism. This systemic career risk means individuals must take personal responsibility for recognizing and acting on bubble warnings.

Grantham states, 'You will not receive the advice from investment advisers to get your tail out of the market, ever. It is not good business for them to do that.' He describes how, in 1999, 99% of analysts privately expected a bear market, but their employers publicly remained optimistic.

3The Looming Fertility Crisis Driven by Environmental Toxins

Grantham highlights a 'chronic baby bust' and a 'cataclysmic decline' in human fertility, with average male sperm count projected to hit zero by 2045. This is attributed to widespread exposure to endocrine-disrupting chemicals (e.g., phthalates, BPAs, PFAs) found in plastics, cosmetics, pesticides, and tap water, which stunt reproductive capacity and disrupt hormones.

Grantham cites Dr. Shanna Swan's research, stating, 'in 20 to 25 years the average young couple will need help getting pregnant.' He links this to 'plastics are leaching toxins' and 'endocrine disruptors' found in cosmetics, food packaging, and pesticides.

4US Lags Dramatically in Chemical Regulation and Social Contract

The US permits 85 agricultural pesticides banned in the EU, China, and Brazil, and has banned only 12 chemicals in cosmetics compared to the EU's 1,300+. This lax regulation contributes to a lower life expectancy in the US (6 years less than Sweden) and a dissolving 'social contract,' evidenced by high maternal mortality rates (20-21 per 100,000, compared to 2.1 in Sweden).

Grantham notes the US has banned '12' chemicals in cosmetics, compared to the EU's '1,500'. He highlights the life expectancy difference between the US and Sweden growing from 2 to 6 years. He also cites maternal mortality rates: US at 20-21 per 100,000, while Sweden is 2.1 and Norway is zero.

Bottom Line

SpaceX's valuation is described as pure 'crazy euphoria,' with its addressable market claims (a quarter of global GDP, mining asteroids) being compared to the South Sea bubble's absurd prospectuses. Grantham believes it will 'fail to deliver anything like its promises.'

So What?

This suggests extreme overvaluation in even highly innovative, high-profile private companies, indicative of a broader market irrationality and a sign of a market peak.

Impact

If SpaceX's valuation collapses, it might become an attractive investment at '10 cents on the dollar' for long-term value investors, but only after a significant correction.

The 'Mag 7' tech giants (Alphabet, Nvidia, Tesla, Microsoft, Meta, Apple, Amazon), which historically enjoyed monopolies in separate markets, are now 'girding for battle' in the same AI marketplace, pouring enormous capital into a competitive struggle.

So What?

This intense, capital-intensive competition in AI could erode their historical monopoly-driven profit margins, leading to a less profitable future for these formerly dominant companies as they fight for market share.

Impact

Investors should be wary of assuming past performance will continue, as the competitive landscape has fundamentally shifted from distinct monopolies to direct confrontation, potentially leading to lower returns.

Opportunities

Green Amazon E-commerce Platform

Create a trusted online marketplace where all products (food, clothing, household goods, etc.) are guaranteed to be free of harmful toxins and environmentally friendly. This addresses the growing consumer demand for safe products and the difficulty of navigating product safety in a toxic world.

Source: Grantham suggests this as a solution to pervasive toxicity, noting someone 'could make money at it.'

Key Concepts

Bubble Theory

Great bubbles always occur around the most important ideas (e.g., railroads, internet, AI). Over-investment leads to spectacular busts, even if the underlying technology is transformative. The greater the idea, the more money goes in, leading to a bigger bubble and a bigger bust.

Tragedy of the Commons

When a shared resource (like clean air, water, fertile soil, or a healthy population capable of reproduction) is used by individuals acting in their own self-interest, it ultimately depletes or degrades the resource for everyone. This applies to the declining birth rates and environmental health due to unchecked corporate practices.

Career Risk in Finance

Investment advisors will never tell clients to exit a bubble market because it's 'bad business' and poses a significant career risk. This systemic bias towards optimism means individuals must take personal responsibility for recognizing and acting on bubble warnings, as no help will come from large financial institutions.

Extrapolation Bias

Markets and human psychology tend to extrapolate current conditions indefinitely into the future, leading to overvaluation during booms and undervaluation during busts. This prevents recognition of cyclical patterns and leads to irrational decisions, as people assume what is good today will continue to be good indefinitely.

Lessons

  • Rebalance Your Investment Portfolio: Sell US stocks and technology holdings, diversifying into non-US equities (emerging markets, Europe, Japan, Canada, Australia), bonds, cash, and a small amount of precious metals (gold/silver).
  • Founders: Secure Capital and Brace for Downturn: If you're an entrepreneur, raise as much money as possible now to build a conservative cash reserve, as capital will become scarce during the impending economic collapse.
  • Mitigate Toxin Exposure, Especially for Pregnant Women: Use apps like Yuka, EWG's Healthy Living, Think Dirty, or Clear Ya to scan products for endocrine-disrupting chemicals. Pregnant women should prioritize organic 'dirty dozen' foods and avoid cosmetics to protect fetal development.
  • Develop Practical, 'Human-Needed' Skills: In anticipation of societal unraveling and job disruption from AI, focus on practical skills like engineering, mechanics, farming, or science that are less susceptible to automation and more vital for community resilience.
  • Consider Geographic Relocation for Quality of Life: Evaluate living in countries with stronger social contracts, better healthcare (lower maternal mortality), and stricter chemical regulations (e.g., Denmark, Japan, Sweden) if societal well-being is a priority over purely financial gain.

Quotes

"

"Don't own US stocks... And if you have a big position in US technology stock, I personally advise would be to sell them all."

Jeremy Grantham
"

"Crypto? No. It's an unnecessary piece of nonsense that facilitates nothing except criminals moving money that they can't be seen."

Jeremy Grantham
"

"This is, I think, the biggest investment bubble in American history."

Jeremy Grantham
"

"You will not receive the advice from investment advisers to get your tail out of the market, ever. It is not good business for them to do that, and they will not ever say it to you."

Jeremy Grantham
"

"In 20 to 25 years the average young couple will need help getting pregnant."

Jeremy Grantham
"

"The US has banned 12 [chemicals in cosmetics]. I am not kidding you."

Jeremy Grantham
"

"It means an agreement that I will behave in a way that helps my neighbors and the society that I'm doing what people expect me to do. I'm not going to misbehave."

Jeremy Grantham
"

"Have the courage to look at that, make your own conclusion, get out of the dangerous most dangerous part, and and do it now. Don't wait for help because no help is coming."

Jeremy Grantham

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