Follow Up to Thoughts on the “AI Bubble”

Dec 3, 2025

I hope you had a great Thanksgiving.
In the spirit of giving thanks, it’s worth pausing to acknowledge how strong stock market returns have been recently and over the past few years.
But it’s also important to remember that it’s not always this good. Returns will likely settle back toward normal levels, and that adjustment can sting.
For context: Over the last fifteen years, U.S. stocks have returned 18.74% per year, compared with a long-term historical average of 9.94%. That gap won’t last forever.
I’m not calling a top or pretending to know what comes next. But history teaches us that while markets reward long-term investors, the short term is unpredictable, and mean reversion is a real force.
This isn’t a moment for panic or celebration, it’s a reminder to stay grounded, stick to a well-reasoned investment and financial plan, and recognize that this is exactly how markets work. Sometimes they feel effortless, sometimes they’re frightening.
Following up on last month’s newsletter, Thoughts on the AI Bubble, today we look at the stock market from a few different angles. Simply put, the U.S. market is richly priced. But on the other hand, today’s companies are better than anything we’ve seen before, so I show why these high valuations could be justified. As with most things of high quality, they’re not cheap.

Thanks for reading.

Investing / Stock Market
  • 📊 What to Do When the Entire Market Looks Expensive –  “NYU professor Aswath Damodaran [someone I respect and trust]…said that for the first time ever, he’s thinking about moving [some of] his money into cash and collectibles — saying there’s no place to hide in the stock market.
  • He’s not alone. Goldman Sachs strategists predicted last week that U.S. equities will likely underperform global peers for the next decade. They recommended that investors ‘Diversify beyond the U.S., with a tilt toward emerging markets.’
  • The S&P 500’s forward P/E [price-to-earnings] ratio is 22x, above its historical average of 17x.
  • The index has traded above 22x only twice since 1985: during the dot-com bubble and the COVID-19 pandemic. The market fell sharply both times.”
  • Below is blended measure of stock market valuations. Across essentially every metric the U.S. market is expensive. That doesn’t mean it can’t or won’t go higher. It’s just that, expensive.
  • So What?
  • If you’re concerned that the U.S. stock market is overvalued, here are your options:

1. Do Nothing. As long as you have an investment plan in place that suits your risk profile and time horizon, the best move might be to just follow your plan.

2. Hold or build cash.Keep your allocation largely the same but directnewcontributions, or perhaps proceeds from overpriced or concentrated assets, into cash.

3. Change your asset allocation/diversify. Adjust your stock/bond mix, increasing exposure to what you believe is undervalued and reducing what you see as overpriced.

  • Within stocks, diversify globally: Roughly one-third internationally is a good starting point.

4. Buy protection. Use derivatives like puts or futures to hedge your portfolio without altering your core holdings.

5. Make leveraged bets. Take aggressive, leveraged positions, such as buying puts or shorting stocks, to profit from a potential market correction.

  • Warren said this recently about this topic:
  • “We’d love to spend it [cash]…It’s just that things aren’t attractive.” For now, it seems, Berkshire is positioned very defensively.
  • Valuations vs. Returns – Stock market valuations, shown on the x-axis below, have historically offered reasonable insight into five-year returns.
  • While it’s a relatively small sample size, if that pattern holds, U.S. market returns over the next five years could be flat or even negative.
  • AI is Huge – “In 2000 the 20 biggest firms on the S&P 500 made up 39% of its total value. Eleven of those were internet-related companies.
  • Today the top 20 account for 52%, with the same number deeply invested in AI.
  • If the tech fails to deliver juicy returns they would all be hit hard.” — The Economist
  • “It’s true that multiples on earnings are historically high, but it’s also true that companies are historically profitable–and valuations have scaled accordingly.
  • The point here is that for all the histrionics, investors aren’t dumb. There’s a clear method to the madness, and it’s all about profitability. Fat margins and growing profits lead to high stock prices, and fat margins and growing profits is exactly what PublicCos keep doing.
  • Now, reasonable minds can disagree about whether forward earnings estimates are correct (and there are of course many other things that affect stock prices), but taking them at face value, there is nothing bubbly at all about current valuations.”
  • 🏦 Record Quarterly Results – Given how profitable today’s companies are, the results and numbers from the following tech companies are extraordinarily impressive.
  • “It was another record quarter for Big Tech, with:
  • Apple revenues growing 8% YoY [year-over-year] to a new Q3 record of $102 billion and net income growing 92% YoY to a new Q3 record of $27 billion.
  • Google revenues growing 16% YoY to a new record high of $102 billion and net income growing 33% YoY to a new record high of $35 billion.
  • Microsoft revenues growing 18% YoY to a new record high of $78 billion and net income growing 12% YoY to a new record high of $28 billion.
  • Amazon revenues growing 13% YoY to a new Q3 record of $180 billion and net income growing 38% YoY to a new record high of $33 billion.”
  • Despite these amazing results, the declines (AKA “drawdowns”), whenever they may happen, can be intense:
Quote of the Month

“When people get very excited, as they are today about artificial intelligence, for example…every experiment gets funded, every company gets funded…The good ideas and the bad ideas. And investors have a hard time in the middle of this excitement, distinguishing between the good ideas and bad ideas.”

– Jeff Bezos

I hope you found these interesting.

As always, please reach out if you have any questions or would like to connect.

Subscribe

Join Our Newsletter

Sign up to receive an email when new articles are posted.

Past performance is no guarantee of future returns.

The graphs and charts in this commentary are for illustrative purposes only and not indicative of any actual investment. Index returns do not reflect any fees, expenses, or sales charges. It is not possible to invest directly in an index. Stocks are not guaranteed and have been more volatile than other asset classes. Historical returns were the result of certain market factors and events which may not be repeated in the future. Financial professionals are responsible for evaluating investment risks independently and for exercising independent judgement in determining whether investments are appropriate for clients.

This material is intended for information purposes only, and does not constitute investment advice, a recommendation or an offer or solicitation to purchase or sell any securities.

Disclaimer: Investments are not guaranteed and are subject to investment risk, including possible loss of the principal amount invested. Past performance is no guarantee of future results. All allocations and opinions expressed are as of the date of this presentation and subject to change. The information contained herein does not constitute investment advice or a solicitation. Information obtained from 3rd parties is believed to be accurate, but has not been independently verified.

The opinions expressed in this article are for general informational purposes only and are not intended to provide specific advice or recommendations for any individual or on any specific security. The material is presented solely for information purposes and has been gathered from sources believed to be reliable, however Think Different Financial Planning cannot guarantee the accuracy or completeness of such information, and certain information presented here may have been condensed or summarized from its original source. Think Different Financial Planning does not provide tax or legal advice, and nothing contained in these materials should be taken as such. As always please remember investing involves risk and possible loss of principal capital. Advisory services are only offered to clients or prospective clients where Think Different Financial Planning and its representatives are properly licensed or exempt from licensure. No advice may be rendered by Think Different Financial Planning unless a client service agreement is in place.