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The Rational Reminder Podcast

Episode 328 - Prof. Stephen R. Foerster: Pursuing the Perfect Portfolio

Oct 24, 2024
Stephen Foerster, a Professor of Finance at Ivey Business School and author, shares insights on the evolution of investing. He discusses iconic financial theories, such as Markowitz’s diversification principles and Sharpe’s risk measures. The conversation dives into John Bogle's advocacy for index funds and the groundbreaking Black-Scholes formula. Foerster emphasizes the distinction between correlation and causation in stock markets, as well as the lessons learned from the Madoff scandal, underscoring the importance of due diligence in portfolio management.
01:09:56

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Quick takeaways

  • The transition from investing as an art to a science has reshaped portfolio management through mathematical theories and risk assessment.
  • Markowitz's diversification theory demonstrates how combining various securities can optimize returns while minimizing overall portfolio risk.

Deep dives

The Evolution of Investing: From Art to Science

Investing has transitioned from an art form, rooted in risk-reward decision-making, to a science that incorporates mathematics and theory. Historically, long-distance traders navigated significant risks, while modern investment theories began to take shape in the early 1900s. The foundational work of Harry Markowitz in the 1950s revolutionized this field by introducing the concept of diversification, showing that combining securities could reduce overall portfolio risk without sacrificing expected returns. This shift changed the approach to portfolio management from a haphazard selection of assets to a structured methodology based on risk assessment and expected performance.

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