Michael Mauboussin

Michael Mauboussin is Kyle’s go-to reference for the luck-versus-skill question in investing. In What Is An Investor research, his work supplies two moves: find performance measures that reflect skill (Process Over Outcome — “we have a strong tendency to dwell on outcomes without considering the role of process… we need to find performance measures that reflect skill, or elements of the outcome that we can control”), and locate an activity on a continuum “from pure skill/no luck on one extreme to no skill/pure luck on the other” (Skill vs. Luck). Kyle uses this to argue a public stock-picker and a card counter sit at the skill end while a day trader and a craps shooter sit at the luck end — but that strategy and outcomes shouldn’t be conflated. The framing comes from his book The Success Equation: Untangling Skill and Luck in Business, Sports, and Investing and his HBR piece “Untangling Skill and Luck,” and underwrites the Paradox of Skill concept.

He also anchors a structural argument in The Death of a Venture Fund research. There Kyle cites Mauboussin’s Morgan Stanley white paper, “Public to Private Equity in the United States: A Long-Term Look,” for the persistence finding — “Funds that have done well continue to do well” — i.e. strength follows strength, a flywheel. Kyle reads this as a caution on the “death of venture” thesis: it implies the brand-name top of the market is more durable than the death framing suggests, with mortality concentrated in the long tail of sub-scale firms.

Context: Michael Mauboussin is an investment strategist and author (long at Credit Suisse and Morgan Stanley, later Counterpoint Global), known for More Than You Know, The Success Equation, and a body of research on decision-making, skill versus luck, and the dynamics of investing.

Where this appears

• What Is An Investor — the May 2022 Kevin Gao conversation; Mauboussin/Wolfe reading notes on skill vs. luck.
• The Death of a Venture Fund — his white-paper persistence finding (“funds that have done well continue to do well”) used to qualify the death thesis.
• The Success Equation: Untangling Skill and Luck in Business, Sports, and Investing — his book, source of the paradox-of-skill and skill-luck-continuum framing.
• Skill vs. Luck — the core concept his work formalizes (process over outcome; placing an activity on the continuum).
• Paradox of Skill — central to his thesis that as everyone gets better, luck plays a larger role in outcomes.
• Process Over Outcome — his HBR framing: find measures that reflect skill, not luck.
• Investment Returns — separating skill from luck reframes how outcomes should be judged.