Episode summary
David Booth: ‘The Markets Work Well for Everybody, Not Just the Insiders’
The Long View
· · Hosts: Ben Johnson, Christine Benz, Amy Arnott · Guests: David Booth
Summary
David Booth argues that modern investing became far more accessible once financial researchers had enough data to test claims made on Wall Street. He says that before the 1960s, investors were often forced to rely on beliefs, but the arrival of serious academic research showed that markets generally work well for everybody, not just insiders. That research helped drive lower fees, better portfolio design, and wider access to public markets.
Booth ties that science to a broader philosophy of life: uncertainty is not something to eliminate, but something to manage. He says investors should trust markets, avoid trying to outguess them, and focus on plans that make sense over the long haul. He also emphasizes that ordinary investors can benefit from calm, evidence-based expectations—stocks have historically returned about 10% a year, while bonds have returned about 4.5% to 5%.
He is skeptical that indexing alone solves every problem, especially in a more concentrated market, and says Dimensional was built to apply the science more flexibly than a plain index fund. But his core message is simple: embrace uncertainty, diversify sensibly, and stay invested rather than chasing predictions or guarantees.
Key takeaways
- Booth says the key breakthrough in investing was the rise of data-driven financial science, which showed that markets work for ordinary investors as well as insiders.
- He argues that trying to outguess the market usually adds cost and anxiety, while broadly diversified market portfolios can deliver a good long-term experience.
- Booth says stocks have historically returned about 10% a year and bonds about 4.5% to 5%, using that history to support a calm, long-term outlook.
- He thinks investors can use active ideas in a limited way, but says 80% to 90% of a portfolio should stay in a sensible long-term approach.
- Booth says uncertainty creates opportunity, so the right goal is to manage uncertainty with a plan rather than try to eliminate it.
Notable quotes
“without data, people are just arguing beliefs”
“the markets work well for everybody. not not just the insiders”
“over the long haul, stocks have about a 10% return”
“Trust the markets. Stay calm and stay invested”
How the episode opens
Please stay tuned for important disclosure information at the conclusion of this episode. — Welcome to the long view. I'm Ben Johnson, head of client solutions with Morning Star. — And I'm Amy Arnot, portfolio strategist for Morning Star.
Today's guest on the long view is David Booth. David is a repeat guest, the founder of Dimensional Fund Advisors, and has just released a new book titled Stay Calm: Learn to Embrace Uncertainty in Investing and Life. Amy, we had such a terrific conversation with David and there are almost too many highlights for me to choose from.
So, I'm going to really call out what I thought was one of the interesting through lines, which really centered on data. And at one point, David shared with us, without data, people are just arguing beliefs. And there was so much time within our industry where investors really were in a data desert.
And really, that foundational layer was critical to everything that David, his colleagues at Dimensional. and so many others around the broader investing industry have ultimately brought to bear for the benefit of so many investors over the years who uh you know once may have felt like outsiders and are now very much inside and benefiting from decades worth of research and work in a way that they couldn't have just without that data foundation. the the throughine of data uh as mundane as it seems today in 2026 really stood out to me.
Yeah, Ben, I thought that was a really interesting point, too. And I really love David's comments about how having access to a more complete data set can really help provide a sense of calmness and reassurance for investors even in an uncertain environment. And another highlight for me, stay tuned to find out more about Gene FMA's favorite Swedish pop group.
From the episode’s captions: roughly the first two minutes, lightly cleaned. Keep watching on YouTube →
Topics
- efficient-market hypothesis
- factor investing
- data in investing
- diversification
- indexing vs active management
Companies and tickers mentioned
- Dimensional Fund Advisors
Watch the episode
Watch “David Booth: ‘The Markets Work Well for Everybody, Not Just the Insiders’” on YouTube
Summary, takeaways and quote selection by Octagon. Quotes are short excerpts; the full conversation is in the episode.
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The Long View, this episode and its artwork belong to Morningstar, Christine Benz - Director of Personal Finance and Retirement Planning, Ben Johnson - Head of Client Solutions, Amy Arnott - Portfolio Strategist. Octagon is not affiliated with the show; this page is an independent summary.
