stock market Archives - Acropolis Investment Management

5 Jan 2026

The History of Market Concentration

We have all noticed that the S&P 500 has become unusually concentrated. What is less obvious is how today compares to earlier eras, simply because the data are harder to find. Bloomberg published a helpful chart over the weekend using the UBS Global Investment Returns 2025 Yearbook (Dimson, Marsh, and Staunton of London Business School), extending back to 1900. Because the series is incomplete before 1925, I anchored the analysis… Read More

By David Ott Tags: Markets, Portfolio Strategy, S&P 500, stock market, Wall Street

17 Nov 2025

International Stocks Gain Some Ground

I’m amazed that the year-to-date return for all of the non-US stocks are up 26.2 percent, and the S&P 500 is ‘only’ up 15.7 percent. It seems like a long time since global stocks have outperformed the S&P 500, so I decided to do some digging. I started with a slightly different index than what I use in the market summary. The summary is all non-US stocks, but for further… Read More

By David Ott Tags: Diversification, Economy, International Investing, stock market, Stocks, Wall Street

20 Oct 2025

Irrational Exuberance Revisited

Many people are asking whether we’re in the middle of an AI bubble, and the answer, in my opinion, is probably yes. The much harder question is what to do about it. A recent analysis by Jason Furman, a Harvard economist and former Chair of the Council of Economic Advisers under President Obama, calculated that 92 percent of economic growth in the first half of 2025 was related to data-center… Read More

By David Ott Tags: Economy, Federal Reserve, stock market, Stocks, Volatility, Wall Street

29 Sep 2025

The Fund Performed Fine. Investors, Not So Much

For several years, Morningstar has released its annual Mind the Gap study, which highlights the difference between what a fund returns and the returns investors actually realize. The study underscores a familiar struggle: investors chase performance—jumping into funds after the best gains have passed, or bailing out during a slump only to miss the rebound. The penalty for this behavior is steeper than many realize. Over the 10 years ending… Read More

By David Ott Tags: Active Investing, Investing, Passive Investing, stock market, Stocks, Volatility, Wall Street

11 Nov 2024

Morningstar Makes Things Right?

In June, I wrote that the S&P 500 had become a growth index by Morningstar’s definition (you can refresh your memory here). I like Morningstar, especially its stock analysis, but it confuses investors by oversimplifying complex topics. While that is a laudable goal (and I try to do the same thing), they go too far. Well, Morningstar saw the problem that the investment community could see and changed their rules!… Read More

By David Ott Tags: Investing, Large Cap Stocks, Markets, stock market, Stocks, Style Drift, Volatility, Wall Street

14 Oct 2024

The Hottest Stocks of All Time

An Arizona State professor, Hendrik Bessembinder, wrote a fascinating paper detailing something that we intuitively sense: a small handful of stocks have created almost all of the wealth over time, and most stocks don’t provide much in the way of returns. It’s one of the reasons we want hot tips (even when we know they aren’t likely to be hot). The paper’s provocative title is “Do stocks outperform Treasury bills?”… Read More

By David Ott Tags: commentary, Diversification, Economy, stock market, Stocks, Volatility, Wall Street

17 Jun 2024

Is the S&P 500 a Growth Index?

In addition to working with private clients, Acropolis has an incredible team of professionals who manage retirement plans, principally 401k plans (click here for more information). I meet with some of the retirement plan trustees to discuss the plan’s investments. When we manage a plan, we want enough choices so participants can build a diversified portfolio but not so many choices that they are overwhelmed by the options and don’t… Read More

By David Ott Tags: Economy, Growth Stocks, Investing, Markets, stock market, Stocks, Value Investing, Volatility, Wall Street

28 May 2024

The Anxiety of Private Markets

I’m writing about private markets again, which may seem odd to long-time readers because we don’t invest in private markets. I routinely think about private investments for two reasons. First, they’re the hottest topic in our industry—what are you doing about privates? Have you heard of this private or that private? Second, as I’ve said many times, I’ve invested in some to learn more about them and see if they… Read More

By David Ott Tags: Alternative Investments, commentary, Economy, Investing, Markets, Private Equity, stock market, Volatility, Wall Street

20 May 2024

Dow Jones Rocks 40,000

When I entered the investment industry upon graduating from college in 1995, the market was hitting all-new highs. The Dow Jones Industrial Average (DJIA), which everyone seemed to pay attention to, had just broken through 4,000 and would hit 5,000 by the end of the year. When the DJIA crossed 10,000 for the first time in 1999, there were tons of photos of traders on the floor of the NYSE… Read More

By David Ott Tags: Economy, Investing, Markets, stock market, Stocks, Wall Street

15 Apr 2024

Why Are Markets Unhappy Right Now?

As noted above, the March Consumer Price Index (CPI) inflation data exceeded expectations. The year-over-year headline rate was expected to be 3.4 percent but was actually 3.5 percent. The core rate, which excludes food and energy, was expected to be 3.7 percent but was 3.8 percent. Those might not sound like big misses at one-tenth of one percent, but the chart below helps tell the story. The chart shows the… Read More

By David Ott Tags: Economy, Inflation, Interest Rates, Investing, Markets, stock market, Stocks, Wall Street

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