Base Rates in Decision-Making

This chapter examines the critical role of base rates in decision-making for life and business, particularly in investing. Through examples like horse racing and the analysis of past performance, it emphasizes the value of historical data over personal bias in making informed predictions.

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Brought to you by Athletic Greens’s AG1 all-in-one nutritional supplement, House of Macadamias delicious and nutritious nuts, and Shopify global commerce platform providing tools to start, grow, market, and manage a retail business.

Michael Mauboussin (@mjmauboussin) is Head of Consilient Research on Counterpoint Global at Morgan Stanley Investment Management.

Prior to joining Counterpoint Global, Michael was Director of Research at BlueMountain Capital, Head of Global Financial Strategies at Credit Suisse, and Chief Investment Strategist at Legg Mason Capital Management. Michael originally joined Credit Suisse in 1992 as a packaged food industry analyst and was named Chief U.S. Investment Strategist in 1999.

Michael is the author of The Success Equation: Untangling Skill and Luck in Business, Sports, and Investing, Think Twice: Harnessing the Power of Counterintuition, and More Than You Know: Finding Financial Wisdom in Unconventional Places. More Than You Know was named one of "The 100 Best Business Books of All Time" by 800-CEO-READ, one of the best business books by BusinessWeek (2006), and best economics book by Strategy+Business (2006). Michael is also co-author, with Alfred Rappaport, of Expectations Investing: Reading Stock Prices for Better Returns.

Michael has been an adjunct professor of finance at Columbia Business School since 1993 and is on the faculty of the Heilbrunn Center for Graham and Dodd Investing. He received the Dean's Award for Teaching Excellence in 2009 and 2016 and the Graham & Dodd, Murray, Greenwald Prize for Value Investing in 2021.

Michael earned an A.B. from Georgetown University. He is chairman emeritus of the board of trustees of the Santa Fe Institute, a leading center for multidisciplinary research in complex systems theory.

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[07:12] Latin roots.

[09:14] No business education? No problem!

[12:15] The best food industry analyst.

[15:36] Consilience.

[19:58] Complex adaptive systems.

[23:26] Diversity.

[26:23] The wisdom of crowds.

[32:42] The minimum effective dose of cognitive diversity.

[36:02] Designing experiments.

[43:49] Against the Gods and Complexity.

[49:56] Value investing and the Santa Fe Institute.

[53:57] A brief 21st-century asset class tour.