Which anomaly relates to the observation that low-beta stock portfolios have outperformed in the past?

• A. Risk parity anomaly
• B. Volatility anomaly
• C. Betting against beta anomaly
• D. Market timing theory

Answer: (C)

The observation that low-beta stock portfolios have outperformed in the past is known as the betting against beta anomaly. This phenomenon indicates that investors have historically been able to achieve higher returns from portfolios with low market risk (low beta) compared to those with high market risk (high beta).

The rationale behind this anomaly is that investors tend to prefer high-beta stocks for their potential to provide higher returns, despite these stocks being riskier. As a result, high-beta stocks can become overvalued, while low-beta stocks may be undervalued. Consequently, low-beta portfolios have often produced excess returns relative to what would be predicted based on their risk profiles. This contradicts traditional financial theories that suggest higher risk should correspond to higher expected returns.

In contrast, the other options do not specifically pertain to the historical outperformance of low-beta stock portfolios. For example, risk parity focuses on balancing risk contributions across different asset classes; volatility anomaly relates to how asset prices respond to volatility; and market timing theory pertains to the ability of investors to predict future movements of the market, rather than the characteristics of low-beta stocks. Thus, the most fitting identification for the anomaly observed is indeed the betting against beta anomaly.