Dimensional’s David Booth on How to Interpret Risk and 'Stay Calm' Amid Uncertainty

Summary

• David Booth, co-founder and chairman of Dimensional Fund Advisors, recorded this discussion on September 3, 2026.
• Booth states that life outcomes result from the compounding of many decisions made over time with no shortcuts.
• Research-quality data for testing investing hypotheses became available in the 1960s with the CRSP data.
• Studies over the last 60 years conclude that professional money management generally fails to add value because skilled managers are too few to separate skill from luck.
• Booth's parents did not invest because they felt like outsiders who would be taken advantage of by insiders.
• A $15,000 sum found in Booth's father's lockbox in 1985 had lost 80% of its purchasing power over 40 years but would have grown to over $1 million if invested at market returns.
• Booth argues that uncertainty creates opportunity and that investors should plan rather than predict.
• Equity market returns over the last 100 years have averaged 10.2%, including a 6% risk premium over riskless assets.
• Booth attributes the persistence of the risk premium to human ingenuity and the ability to adapt during bad economic scenarios.
• The 2020 pandemic recession lasted only one quarter due to the entrepreneurial spirit of people finding new ways to operate.
• Missing market gains during downturns is costly because there are no mulligans in investing.
• Booth believes owning a share of the market allows participation in the upside of human ingenuity.
• Dimensional challenged its leadership team in 2004 to grow assets from $50 billion to $500 billion, a goal they achieved.
• Dimensional now sources more than two-thirds of its assets from the RIA market.
• Dimensional requires RIA advisors to attend seminars and use platforms like Schwab, Pershing, or Fidelity to access their funds.
• Dimensional hires team players who believe in their evidence-based point of view rather than those focused on active trading.
• Booth distinguishes between investing in the market and gambling in prediction markets.
• Booth credits his high school math teacher, Mrs. McReynolds, for believing in him after he failed a calculus test, which changed his career trajectory.
• Booth emphasizes that wisdom comes from understanding that there are no shortcuts and that long-term results depend on compounding decisions.