🟢 [E6960] Robert Shiller's early volatility studies demonstrated that stock prices were far more volatile than underlying dividend fundamentals, constituting evidence that markets are not perfectly rational. Shiller called the assumption of rational efficiency 'one of the most remarkable errors in the history of economic thought,' supporting the case for systematic market mispricing and potential corrections.

💬 [E6962] Portfolio insurance strategies, pioneered by Leland, O'Brien, and Rubinstein in the late 1970s, attempted to create synthetic options through dynamic hedging for pension fund risk management. This early innovation in portfolio construction demonstrated both the promise and limitations of model-driven hedging approaches that would later contribute to the 1987 crash.

💬 [E6959] The Black-Scholes options pricing model, adopted as the house formula of the Chicago Board Options Exchange at its April 1973 launch, became a self-fulfilling prophecy — setting options prices rather than merely predicting them. This represents a key historical example of financial theory becoming market reality, raising questions about whether quantitative models describe or construct market regimes.

💬 [E6961] Kahneman and Tversky's behavioral finance experiments revealed systematic cognitive biases in decision-making, providing early empirical challenges to efficient market theory. These findings laid groundwork for understanding how investor psychology drives regime shifts, herding, and mispricing cycles that structural cycle frameworks must account for.

💬 [E6963] Michael Jensen extended efficient market theory to corporate governance, arguing stock markets could monitor executive behavior and that takeovers served as market discipline mechanisms. His agency theory provided the intellectual justification for the 1980s corporate takeover boom involving hundreds of deals, demonstrating how academic frameworks shape real capital allocation cycles.