Podpower Episode AtlasIn this episode of Excess Returns, host Justin Carbonneau sits down with renowned investor Jeremy Grantham, co-founder of GMO. Grantham, often labeled a "perma-bear" (a title he humorously disputes), shares insights from his book, "The Making of a Perma Bear," and discusses his investment philosophy centered on mean reversion. He recounts pivotal moments in his career, including navigating the 1982 market low, the dot-com bubble, and the 2008 financial crisis, emphasizing the importance of acting decisively when opportunities arise, even if terrifying.
The conversation delves into the concept of mean reversion, explaining why asset classes, sectors, and even companies tend to cycle back to historical averages. Grantham critically examines the rise of monopolies, particularly the "Magnificent Seven," and how government inaction has allowed them to dominate, slowing overall economic growth. He then offers a nuanced perspective on Artificial Intelligence, arguing that while transformative, it will eventually become a mere cost of doing business, unlikely to sustain elevated aggregate profit margins long-term.
Grantham also defines market bubbles as rare "two-sigma events" and shares his experience identifying and navigating them, from Japan's 1980s bubble to the dot-com bust and the 2021 market frenzy. He concludes with profound reflections on life's purpose, the importance of choosing a useful career, and the critical environmental and societal risks humanity faces. His ultimate advice to investors is to fight the human tendencies of avoiding unpleasant news and short-term thinking, advocating for a realistic, long-term perspective.
The idea that everything important in markets, from asset prices to sector performance and even company profitability, tends to return to its historical average over time. Grantham highlights its predictive power for long-term returns.
Why careUnderstanding mean reversion helps investors anticipate future market movements and identify undervalued or overvalued assets, guiding long-term strategy.
Grantham's statistical definition of a market bubble as a "two sigma event," an extreme outlier that happens rarely in a random series. He notes that historically, these events in developed stock markets always revert to the pre-existing trend.
Why careThis definition provides a quantifiable framework for identifying dangerous market overvaluations, helping investors avoid significant losses.
Grantham argues that while AI is a transformative technology, its long-term impact will be similar to past innovations like computers: an initial competitive advantage for early adopters, but eventually a standard, non-differentiating cost for all, not significantly boosting aggregate profit margins.
Why careThis perspective challenges the prevailing narrative of AI as an endless profit engine, suggesting that its economic benefits will normalize over time.
Grantham observes a trend of increasing concentration and dominance by a few large companies across industries, often without government intervention. He argues that while this boosts monopolist profit margins, it slows the overall growth rate of the economy and exacerbates inequality.
Why careThis highlights a structural shift in capitalism that can lead to slower economic progress and wider wealth disparities, impacting investment opportunities and societal well-being.
A rare market signal Grantham identifies at the top of major bubbles (1929, 1972, 2000, 2021), where market leaders of the previous year begin to decline significantly while the broader market (S&P) continues to rise.
Why careThis specific indicator helps identify the late stages of a bull market when speculative excesses are being unwound in riskier assets, signaling an imminent broader market downturn.
Grantham advises investors to actively combat two inherent human biases: the aversion to unpleasant news and a short-term focus. He suggests being realistic and adopting a 5-year horizon.
Why careOvercoming these psychological hurdles is crucial for making rational, long-term investment decisions and avoiding common pitfalls driven by emotion or immediate gratification.
"As a species we do not do unpleasant news and we do not do long-term and my advice to the investor is try and fight those two tendencies."
"If you make abnormal profits, you will receive competition. If you make obscene profits, you'll you'll get ferocious competition."
"We have gone from a monopoly world to a brutal competitive world and we will stay there for years and there will be blood in the streets because these are aggressive take no prisoner type companies with lots of money and they are heading right into each other's teeth."
"If you are waiting, dear listen, to be told to abandon ship by the Goldman Sachs and the JP Morgans, you will have a long wait. They have never told you. They never will tell you because it's simply bad business for them."
"My belief is that we would have we would have gone into a minor recession... and AI headed it off."
"Firing a value manager under these conditions and hiring another growth manager was on the very border a fiduciary responsible."