Weird things happen to economies when you have huge bursts of productivity that are concentrated in one industry. Obviously, it’s great for that industry, because when the cost of something falls while its quality rises, we usually find a way to consume way more of that thing – creating a huge number of new jobs and new opportunities in this newly productive area.

But there’s an interesting spillover effect. The more jobs and opportunities created by the productivity boom, the more wages increase in other industries, who at the end of the day all have to compete in the same labor market.

Our explosion of demand for data centers means there’s infinite work for HVAC technicians. So they get paid more (even though they themselves didn’t change), which means they charge more on all jobs (even the ones that have nothing to do with AI). Furthermore, the next generation of plumber apprentices might decide to do HVAC instead; so now plumbing is more expensive too. And so on.

The Baumol Effect; “We’ll spend more on what doesn’t get more productive,” is top of mind right now, as we watch in awe at what is happening with AI Capex spend.

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Academics have published new research on the impact that Short Form Videos (SFV) like TikTok, Instagram Reels and Youtube shorts have on cognitive and mental health. The report systematically reviews and analyzes 71 studies involving over 98,000 participants.

If you just read just the findings below it would be indistinguishable from an addiction to a hard drug:

• SFV use is linked to poorer cognitive performance, with the strongest deficits in attention and inhibitory control, suggesting users struggle to focus and suppress impulses.
• Frequent exposure to fast-paced, highly rewarding SFV content may rewire attention systems, fostering “rapid disengagement” from tasks that are slower or require sustained effort, reducing cognitive endurance over time.
• SFV use is associated with poorer overall mental health, with the strongest links to stress and anxiety, indicating consistent emotional strain among heavier users.
• Heavy SFV use reinforces impulsive engagement loops driven by dopamine rewards, contributing to compulsive scrolling and difficulty disengaging, patterns resembling behavioral addiction.
• Short-form video consumption is associated with poorer sleep quality, especially when used at night, due to overstimulation and blue light disrupting melatonin, which can worsen mood and cognitive functioning.
• Higher SFV use correlates with increased loneliness and reduced life satisfaction, as digital interactions replace real-world social connection for some users.
• Negative effects occur across both youth and adults, meaning the cognitive and emotional risks of SFV use are not limited to developing brains; adults experience similar declines and mental health associations.

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These days, it’s all stocks all the time, with reputable authorities calling on small investors to put everything they have saved into equities. Older investors are reminded of the mantra so common in 1999: “Every penny you don’t have invested in stocks will hurt you.”

More than a generation ago, financial historian Peter Bernstein wrote about investors’ “memory banks,” the market experience that accumulates in their hippocampi over their investing lives and molds their investment strategy. As he put it, looking back on the 1990s: “Most of the new participants in the market had no memory of what a bear market was like.”

And here we are today, almost seventeen years into a great bull market. Rather like 1999, also seventeen years into a long-term bull market, or 1966, once more seventeen years. Or 1873, sixteen years in, or 1837, eighteen years in, or 1893, twenty years in — to name a few of the notable tops over the past two centuries. Just long enough to produce empty memory banks in just enough investors.

A new generation of investors have never personally experienced a long-term bear market. Their memory banks are devoid of the damage wrought by the Grim Reaper of equity risk. Let’s be generous and assume some have read market history and know that stocks can lose money — sometimes, a lot — and take months, if not years, to recover. There’s a difference, though, between being told that markets can fall by more than 50% and having it burned into your memory banks by seeing your net worth halved in real time as the economy careens towards the precipice.

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Historically, valuations have been a useful (though not perfect) indicator of real returns over the following decade. Below, you’ll see historical CAPE readings (in black) for the U.S. market alongside their corresponding forward ten-year real returns (in green). The conclusion is straightforward: when valuations are low, future returns tend to be above average; when valuations are high, forward returns tend to be much more muted.

Right now, the U.S. market sits at a CAPE ratio of around 40. It’s nearly double the long-term average of roughly 20, and the second most expensive in history.

historically, when valuations have climbed to this level, the following decade hasn’t been kind to investors. Not once has a country that ended a year with a CAPE above 40 produced positive real returns over the next ten years. That’s not a personal opinion but what the data shows.

To get a sense of what current valuations might mean going forward, I ran a linear regression using historical CAPE data and forward ten-year real returns. The relationship is remarkably consistent: as valuations rise, future returns fall. At today’s valuation levels, the regression suggests an expected real return of -2.46% for the next decade. From a historical perspective, the last time we were at the CAPE reading we find ourselves in today, the market went on to lose -2.11% per year for the next ten years.

Valuation isn’t the only red flag flashing. Today, about 40% of the market is concentrated in its 10 largest companies. This is the most concentrated the market has ever been.

Concentration itself isn’t a bearish sign. What really matters is how concentration changes going forward. Rising concentration tends to coincide with strong market performance as leading firms continue to gain share and deliver growth. On the other hand, when concentration starts to fall, this means your largest players are underperfoming the rest of your portfolio, and that’s when returns have historically suffered. If the biggest names continue to pull away from the pack, the market could remain strong for a while. But if that leadership falters, history suggests the unwind can be painful.

Psychologist and writer Adam Mastroianni has been trying to figure out why adults have so much trouble making friends and Derek Thompson spoke with him to discuss:

Mastroianni: It seems like the takeaway from this research that has been done over the past 10 years or so is that people are way too negative about their own social abilities and the things that are likely to happen when they talk, especially to someone new. So, for instance, they underestimate how pleasant it’s going to be to talk to someone new. But even afterward, when we ask them, hey, how much did you like that person? They say oh, I like them a lot. And when we ask, how much did they like you? Oh, less than that. I ran one study with some friends of mine where we had people talking groups of three and we’re like, okay, how much did you like them? People would say 5 or 6 out of 7. And how much did they like you? People would say 4 or 5 out of 7. On average, people thought they were the least liked person in the conversation, which obviously can’t be true for each person.

Thompson: We are, on the one hand, the social animal. Yet we delude ourselves about the degree to which we’re a fun hang. We’re the social species and we’re the socially anxious species as well.

Mastroianni: Yeah, well, we’re the ones who care about it the most. And so we have the most to lose. And so we worry about it the most in part in the hopes that maybe it makes us better at doing it. The way I think about it is in our evolutionary history, we lived in groups. But how often did we meet someone who we literally had no connection to before? I can’t imagine it was all that often. But today it can happen literally every day. You get on the bus and it’s full of people that aren’t related to you. You don’t know them. They don’t know you. That’s a really weird thing to do.

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Morgan Stanley surveyed all stocks trading on U.S. exchanges over a 40-year period, between 1985 and 2024. They found the median stock experienced a decline of 85% at one point or another. Worse yet, more than half of these stocks never fully recouped their losses. The median stock recovered to just 90% of its prior high-water mark. Among those stocks that were able to reclaim their prior highs, it was a long process—about five years, on average. 

Those numbers only apply to the median stock, but suppose you had above-average stock-picking skills. How would things have turned out? If you had the foresight to pick the 20 best performing stocks over that 40-year period, at some point they still would have delivered an average agonizing draw-down of 72%.

It’s hard to remember, but Apple dropped 83% at one point. Nike once lost 66%. Even Nvidia, which was the best performing stock over the past 20 years through 2024, lost more than 90% at one point. And most notably, Amazon was once down 95% from its prior high.

Over the long term, share prices tend to move in tandem with corporate profits. When a company’s earnings increase, often its share price does too. The problem is that prices are only sometimes rational. Very often, stock prices disconnect from corporate earnings, and the gap can be significant.

This was first proven empirically Daniel Kahneman and Amos Tversky. In 1974, they published a paper that found investors exhibit an “availability heuristic.” That is, they tend to rely on the information that is most available. That’s a problem because the information that happens to be most available isn’t necessarily the information that’s the most accurate or even relevant. Often, the information that happens to come to mind is the information that’s most vivid. In other words, extreme information or news becomes most memorable, and thus drives decision-making.

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ChatGPT users may want to think twice before turning to their AI app for therapy or other kinds of emotional support. Sam Altman, OpenAI’s CEO:

“People talk about the most personal sh** in their lives to ChatGPT. People use it — young people, especially, use it — as a therapist, a life coach; having these relationship problems and [asking] ‘what should I do?’ And right now, if you talk to a therapist or a lawyer or a doctor about those problems, there’s legal privilege for it. There’s doctor-patient confidentiality, there’s legal confidentiality, whatever. And we haven’t figured that out yet for when you talk to ChatGPT. This could create a privacy concern for users in the case of a lawsuit, because OpenAI would be legally required to produce those conversations today.“

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The average young person is on course to spend 25 years of their life on their phone. Plus more on other screens. Most of them don’t want to live this way, but feel trapped.

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A fascinating walk-through explaining why the length of new songs became much shorter around 2019, and has slowly started increasing again over the last year.

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How Country Music Took Over the Charts: A Statistical Analysis.

The 1990s were a turning point for country’s mainstream acceptance, driven by two mutually reinforcing phenomena:

1. Improved Telecommunication Infrastructure: The Telecommunications Act of 1996 enabled American media companies to consolidate regional stations into national networks, facilitating country radio play outside of rural strongholds. Simultaneously, enhanced geographic radio coverage brought consistent access to under-served rural listeners. Together, these infrastructure improvements fostered a virtuous cycle: greater airplay propelled more country songs onto the charts, which in turn drove even more airplay.
2. Country Crossover Successes: Country crossovers like Garth Brooks, Shania Twain, and Tim McGraw blended conventional genre staples with accessible pop and rock influences, broadening the format’s appeal beyond its traditional fanbase.

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Something unusual—and incredibly fast—is happening with teenagers running the 100-meter around the world. From Japan to the U.K., young speedsters are posting eye-popping times in track’s most prestigious event. What’s driving these turbocharged athletes who aren’t old enough to vote?

One major cause is the relatively recent arrival of super spike shoes, which has helped lower times across the board. But just as significantly, the line between amateur and pro track athletes is fuzzier than ever. Prodigies are accessing better coaching, and they’re able to sign endorsement deals, which adds a financial incentive to improve.

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Pretty incredible graph for Americans:

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The number of companies listed on U.S. stock exchanges has decreased substantially since its peak in 1996, as it nearly halved to less than 4,700 in 2022. At the same time, the number of U.S. PE-backed
companies grew to over 11,000.

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Peter Bernstein liked to say that investors have memory banks: the market returns collectively earned by people of similar age. Experience shapes expectations. The problem is that your memory bank can deceive you in dangerous ways. Your experience of the past is a reasonable guide to the future only if the future turns out to resemble the portion of the past that you’ve lived through. And it often doesn’t. It’s worth looking at a few investing beliefs that your memory bank might hold—and asking whether they’re still valid.

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How much longer will emerging markets be undervalued and hated?

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Nasdaq Price to Earnings valuations are at the very high end of their historical range. That means they are extremely expensive.

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AQR’s most recent report analyzes how the CAPE ratio and other P/E metrics, while far from perfect, still remain the best available predictor of long-run future market stock returns.

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While countries like the United States and India are extremely expensive relative to the rest of the world, the global stock market as a whole has seen its P/E ratio rise dramatically from the early 2010s.

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Looking at Enterprise Value (EV) divided by sales, we’re not above the 2000 and 2021 bubble peak for global stocks:

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Lyn Alden just released an absolute masterpiece of a newsletter on Fiscal Dominance and the impact it will continue to have on the economy and financial markets moving forward. She walks through:

• What fiscal dominance is and how we got here
• Why government spending is now more important than bank/private sector lending
• Why central bank tools become ineffective at combating inflation in this new environment
• Why DOGE will fail to reach its goals on cutting government spending
• Why the stock market, not labor markets, have become the dominant driver of tax revenues
• What to own/invest in to navigate the through the years ahead

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A phenomenal Q&A with Russell Napier, market strategist and historian, discussing how the global economy and financial markets will look in the months and years ahead.

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Forget about making a New Year’s resolution. Have you tried imagining your deathbed? It’s called a Premortem. It’s a habit that began for Ron as a response to the death of his parents in the 1990s. His mother was at peace with herself when she died, he says. But his father was “racked with regret and remorse” about decisions he made and the opportunities he missed. What he took away from their experiences was the last lesson that his parents would teach him—and the most profound of them all. Don’t wait until the end to decide if you are proud of your life. Do it before it’s too late. Do it while you can still do something about it. To him, there is nothing macabre or even remotely depressing about ruminating on death. In fact, he finds it to be oddly inspiring. 

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There’s one particular, very achievable commitment in mind that will help you become happier and improve your health and effectiveness: This year, start getting up early.

• Our brain exhibits greater functional connectivity in the mornings. This, we might assume, facilitates better performance of complex tasks.
• It tends to enable the achievement of other popular goals. The goal-directed brain regions—such as the hippocampus and orbitofrontal cortex—work better at this time than later in the day.
• One habit that is easier to adopt first thing in the morning is exercise. Clear data exist to show that when people intend to exercise early in the day, they are significantly less likely to experience “intention failure” than if they plan to exercise later.
• People who get up early enjoy a more positive mood throughout the day compared with those who rise late.

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All the major Wall Street brokerage and bank strategists failed to anticipate how well the market would do in 2024. Only part of the problem is that they are bad at predictions; the bigger issue is that they do it all. It’s kinda like Phrenology, the pseudoscience feeling bumps on people’s skull to predict their personality traits. It’s not that there are better or worse phrenologists, but rather, why was anyone doing phrenology? Think about how variable the future is. Random events can and will completely derail the best laid plans we may make. Even the most well-ordered, thoughtful forecasts turn to mush when randomness strikes. And randomness is served up daily.

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It’s a big world out there. The U.S. makes up a little less than half of the global market cap. By avoiding international stock markets, you cut out half of the investment opportunities. Why limit yourself?

The chart below breaks down the annual performance of developed international stock markets. Each country’s performance seems to bounce around at random year after year, but over the long term those returns smooth out. While it’s difficult to pick the best performing country every year, a diversified global portfolio offers the benefits of international stock market performance which in turn lowers risk.

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Zooming out to all asset classes, U.S. stocks crushed everything in 2024, as they have for the last 15 years: