In this episode, we kick off our book project, "The Most Important Investing Lesson: What the World’s Best Investors Would Teach You", with a deep dive into the ideas of Michael Mauboussin. We explore his most enduring lessons—concepts that have reshaped how we think about investing, decision making, and life. From base rates to expectations investing, we unpack how Mauboussin’s frameworks can help investors build better models of the world and make more rational, probabilistic decisions.

Main topics covered:

Why base rates are the most underused yet powerful tool in investing and life
How to apply expectations investing and reverse engineer stock prices
Why multiples are not valuation and how to earn the right to use shortcuts
Understanding the paradox of skill and why luck matters more when everyone is good
Lessons investors can apply across fields like business, sports, and personal decision making
How humility, reference classes, and feedback loops improve judgment
Reflections on learning, writing, and how AI tools are changing the creative process

Timestamps:
00:00 Introduction and the idea behind the book
04:00 Michael Mauboussin on base rates and decision making
10:00 Expectations investing and reversing the valuation process
19:00 Multiples are not valuation—understanding shortcuts
28:00 The paradox of skill and why luck matters more than we think
38:00 How to apply these ideas in investing and life
45:00 Closing thoughts and audience feedback on the book project

The Most Underutilized Concept in Investing | Four Lessons from Michael Mauboussin

Two Quants and a Financial Planner