Lasse HejePedersen The seminal research paper, "Betting Against Beta," published in 2014 by Andrea Frazzini and Lasse Heje Pedersen, introduced a compelling investment strategy that has since become a cornerstone in academic and practitioner discussions of factor investingBetting Against Beta. This strategy, often referred to as the Betting Against Beta (BAB) factor, challenges traditional notions of risk and return by advocating for a portfolio construction that goes against the conventional wisdom of higher beta correlating with higher expected returnsBetting Against Beta.
At its core, the concept of betting against beta posits that assets with lower systematic risk (low beta) tend to offer superior risk-adjusted returns compared to those with higher systematic risk (high beta).2025年12月31日—This data set is an updated and extended version of the original data set for “Betting Against Beta” (Frazzini and Pedersen, 2014). This contradicts the predictions of the Capital Asset Pricing Model (CAPM), which suggests a positive linear relationship between an asset's beta and its expected return. Frazzini and Pedersen's (2014) Betting Against Beta (BAB) factor is designed to systematically exploit this observed anomalyBetting Against Beta Factor in International Equities.
The primary objective of the betting against beta strategy is to generate positive risk-adjusted returns by taking long positions in low-beta assets and short positions in high-beta assets. This creates a zero-cost zero-beta portfolio, meaning the overall portfolio is designed to have a beta close to zero, thereby reducing its sensitivity to market movements.作者：A Frazzini·2012·被引用次数：3153—We present a model with leverage and margin constraints that vary across investors and time. We find evidence consistent with each of the model's five ... The asymmetry in returns arises from the fact that high-beta stocks, despite their higher theoretical risk, have historically underperformed low-beta stocks on a risk-adjusted basis.
The Betting Against Beta (BAB) factor is built upon this principleBetting Against Beta. It involves identifying a universe of assets, calculating their betas, and then constructing a portfolio that is long a basket of low-beta stocks and short a basket of high-beta stocks.2014年1月1日—In particular,Frazzini and Pedersen(2014) conducted a comprehensive research to document the low-betaanomaly over various asset classes. They ... The weighting within these baskets can vary, but often aims to equalize volatility or some other risk measure across the components. The authors, Frazzini and Pedersen, presented extensive empirical evidence supporting the efficacy of this strategy across various markets and asset classes, including U.Betting against betting against betaS. equitiesThe “Betting-Against-Beta” is thezero-cost zero-beta portfoliothat is long on the low-beta portfolio and that shorts the high-beta portfolio..
A key contribution of the Betting Against Beta paper by Frazzini and Pedersen is the theoretical framework used to explain why this anomaly might persist.(PDF) Betting Against Beta They present a model where differences in investor constraints, particularly regarding leverage and margin requirements, can lead to this outcome作者：LH Pedersen·被引用次数：6—[Frazzini and Pedersen, Prop. 4.] Constrained investors hold high-betaassets while unconstrained investors hold low-betaassets and possibly apply leverage. ➢ .... In their model, investors who are prohibited from using leverage or have limited access to it tend to gravitate towards holding high-beta assets. Conversely, investors with greater access to leverage can afford to short high-beta assets and allocate capital to low-beta assets, potentially rebalancing them to achieve their desired risk profiles.
This dynamic creates an environment where high-beta stocks are in higher demand from constrained investors, driving up their prices and consequently lowering their expected returns. Simultaneously, low-beta stocks may be relatively "underpriced" or less sought after by these same investors, leading to higher future returns. The paper, "Betting against beta," emphasizes that this behavior of tilting toward beta suggests high-beta assets require lower risk-adjusted returns than low-beta assetsBetting Against Beta: Equity Factors Data, Monthly. This is a fundamental insight that underpins the proposed a Betting Against Beta (BAB) factor.
The empirical evidence supporting the Betting Against Beta strategy is substantial and has been replicated in numerous studies.This project is based upon the paper:Frazzini, A. &Pedersen, L. (2014).Betting against beta. (referred to as "the paper" in the following content) Frazzini and Pedersen's (2014) Betting Against Beta demonstrated that this factor has historically delivered significant positive risk-adjusted returns, often outperforming traditional market-cap-weighted indices.2025年9月21日—The aim is to generate a return bybetting against betathrough a market-neutral long-short factor that goes long a portfolio of low-beta stocks ... The anomaly has been observed not just in equities but also in other asset classes, leading to a broader application of the conceptBetting Against Beta.
Further research has explored nuances and extensions of the original Frazzini and Pedersen work. For instance, the paper "Betting against betting against beta" by Novy-Marx (2018) and subsequent works have examined the robustness and potential variations of the strategy. Additionally, updated datasets and research, such as the "Betting Against Beta: Equity Factors Data, Monthly" (updated and extended from the original 2014 data), continue to provide valuable insights and confirm the persistence of the low-beta anomaly作者：R Novy-Marx·2018·被引用次数：155—Frazzini and Pedersen's (2014) Betting Against Beta(BAB) factor, based on the same basic idea as Black's (1972) beta-arbitrage, exhibits striking backtested.. The aim to generate a return by betting against beta through a market-neutral long-short factor that goes long a portfolio of low-beta stocks and shorts high-beta stocks remains a central theme.
The concept has also led to the development of financial productsBetting Against Beta. An Betting Against Beta ETF or similar investment vehicles aim to capture the essence of this strategy作者：A Frazzini·2010·被引用次数：3153—Betting Against Beta - Andrea Frazzini and Lasse H. Pedersen. 20. This table shows calendar-time portfolio returns. BAB is a portfolio short (de-levered) high .... However, implementing the betting against beta strategy requires careful consideration of transaction costs, liquidity, and the specific methodology used to define and rebalance the low-beta and high-beta portfolios.作者：TG Bali·被引用次数：39—Abstract. Frazzini and Pedersen (2014) document that abetting against beta strategythat takes long positions in low-beta stocks and short positions in ...
In conclusion, the Betting Against Beta research by Andrea Frazzini and Lasse Heje Pedersen has profoundly influenced quantitative finance. By challenging conventional wisdom and providing a robust theoretical and empirical foundation for the low-beta anomaly, their work offers a powerful tool for investors seeking to improve risk-adjusted returns through a systematic approach to betting. The persistent evidence supporting the BAB factor underscores its importance in the modern investment landscape.
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