Robert Haugen's "Modern Investment Theory" challenges traditional market efficiency by advocating for active management based on multi-factor models that include firm size, volatility, and earnings growth. While the full 5th edition requires purchase, key chapters and foundational concepts regarding portfolio construction are available via academic previews and digital archives. Access selected chapters through MIT or explore loan options via Internet Archive .

Haugen's modern investment theory has several implications for investors:

  1. The Rational Price: What the stock is actually worth based on future cash flows.
  2. The "Irrational" Price: What the crowd says it is worth today.
  3. The Mechanical Price: The impact of forced buying (index funds, rebalancing).

Haugen, R. A. (2010). The Inefficient Stock Market: What Pays Off and Why. Pearson Education.

Whether you find the 6th edition via Pearson’s digital library or a university archive, focus on the anomalies and arbitrage chapters. In an age where "modern" finance changes every 18 months, Haugen’s insights on volatility and value are timeless.

  1. Efficient Market Hypothesis (EMH): Haugen discusses the EMH, which assumes that financial markets are informationally efficient, meaning that prices reflect all available information. However, he also critiques the EMH, highlighting its limitations and the existence of anomalies.
  2. Risk and Return: The book thoroughly explores the concepts of risk and return, including the Capital Asset Pricing Model (CAPM) and the Arbitrage Pricing Theory (APT). Haugen explains how to measure risk and how it relates to expected returns.
  3. Portfolio Optimization: Haugen covers the process of portfolio optimization, including the use of mean-variance analysis, Black-Litterman models, and other techniques for constructing optimal portfolios.
  4. Behavioral Finance: The author discusses the role of behavioral finance in modern investment theory, highlighting how psychological biases and heuristics can influence investment decisions.

Why "Modern Investment Theory" Remains Relevant

Some key concepts in Haugen's modern investment theory include:

Derivatives & Hedging:

The book is known for its extensive coverage of European and American options, as well as the Black-Scholes model . It emphasizes how these tools are used for hedging rather than just speculation. The Evolution of Modern Investment Theory