Dimensional (DFA) vs. Vanguard

Key Concepts

• Index Funds: Funds that aim to replicate the performance of a specific market index (e.g., S&P 500).
• Dimensional Fund Advisors (DFA): A company that applies academic finance principles to portfolio construction, aiming to capture market premiums beyond broad market indexing.
• Vanguard: A company renowned for its low-cost index funds.
• Market Capitalization Weighted Index: An index where the weight of each constituent security is determined by its total market value.
• Academic Finance Renaissance: A period in the mid-20th century marked by significant theoretical advancements in finance, including diversification, efficient markets, and asset pricing models.
• Diversification: Spreading investments across different asset classes and securities to reduce risk.
• Efficient Markets Hypothesis (EMH): The theory that asset prices fully reflect all available information, making it difficult to consistently "beat the market."
• Capital Asset Pricing Model (CAPM): A model that describes the relationship between the systematic risk of an asset and its expected return, primarily driven by market risk.
• Fama-French Five-Factor Model: An extension of CAPM that includes size (small cap premium), value, profitability, and investment as additional factors explaining differences in expected returns.
• Risk Premiums: Higher expected returns associated with taking on specific types of risk (e.g., small cap premium, value premium).
• Alpha: Excess risk-adjusted return that cannot be explained by exposure to systematic risk factors.
• Anomalies: Market phenomena that appear to contradict established financial theories, such as the consistent outperformance of certain stock characteristics.
• ETFs (Exchange-Traded Funds): Funds that trade on stock exchanges like individual stocks, often tracking an index.

Dimensional Fund Advisors vs. Vanguard: An Academic Approach to Investing

This video, presented by Ben Felix, Chief Investment Officer at PWL Capital, explores the historical connections and philosophical differences between Vanguard and Dimensional Fund Advisors (DFA), two prominent investment companies with roots in the index investing revolution. While Vanguard is synonymous with low-cost index funds, DFA employs a more nuanced approach, leveraging academic finance theory to construct portfolios that aim to outperform market-cap-weighted indexes by capturing various risk premiums. PWL Capital utilizes DFA funds in client portfolios, and the presenter invests 100% of his own liquid financial assets in them.

Historical Roots and the Birth of Index Investing

The story of both companies begins in 1964 with MC Mown, a founding director of DFA and the creator of the first index fund. Mown was part of a quantitative investment strategy think tank at Wells Fargo, assembling a team of academics whose work would later contribute to Nobel Memorial Prize wins in Economic Sciences. This era was a "renaissance" in academic finance, with groundbreaking research from Harry Markowitz on diversification, Eugene Fama on efficient markets, and William Sharpe on the Capital Asset Pricing Model (CAPM). These theories suggested that traditional active management, focused on stock picking and market timing, was less effective than previously believed, and that active managers often delivered little beyond market risk at a high cost.

This led to the sensible premise that minimizing costs and capturing market returns was the most effective approach. The Wells Fargo group developed the concept of an index fund, which replicates a market index rather than attempting to beat it. The first large-cap index fund was implemented by Wells Fargo Investment Advisers for the Samsonite pension plan in 1971. Due to regulatory restrictions (Glass-Steagall Act), Wells Fargo could not offer these funds to retail investors. Recognizing the innovation's potential, they shared their research freely with John Bogle, the founder of Vanguard.

Vanguard launched the first large-cap equity index mutual fund for retail investors in 1976. Despite initial skepticism, referred to as "Bogle's Folly," Vanguard has grown into one of the world's largest asset managers, with over $8 trillion under management. While known for index funds, Vanguard also manages a significant amount in actively managed funds ($1.8 trillion).

Dimensional Fund Advisors' Distinct Approach

Dimensional Fund Advisors, led by David Booth (who was part of the original Wells Fargo group), launched its first small-cap fund in 1981. With $814 billion under management, DFA is a major asset manager, though smaller than Vanguard. Booth's initial idea was to offer small-cap diversification to institutions, which were predominantly invested in large caps. Since small-cap stocks were more expensive to trade and no small-cap index existed at the time, DFA developed a flexible product that mimicked an index fund without rigidly adhering to index reconstitution dates.

While market-cap-weighted index funds are beneficial due to low costs, broad diversification, tax efficiency, and consistency with finance theory, they are not the only path to these advantages. Academic research, notably by Eugene Fama and Kenneth French, identified systematic premiums beyond market risk.

• Small Cap Premium: Small-cap stocks have historically delivered higher returns, explained by their exposure to market risk.
• Value Premium: Stocks with low prices relative to their fundamentals tend to outperform.
• Profitability Premium: Stocks with stronger profitability tend to outperform.

These findings challenged the CAPM, suggesting that market efficiency might be better explained by a more comprehensive model. The Fama-French five-factor model, proposed in 1992 and expanded in 2015 and 2017, incorporates market risk, size, value, profitability, and investment to explain approximately 95% of the differences in returns between diversified portfolios. This implies that what might appear as "alpha" (excess risk-adjusted return) from active managers could often be attributed to exposure to these systematic risk factors. This phenomenon is referred to as the "Incredible Shrinking Alpha" in a 2020 book.

DFA, maintaining close ties to academia, has incorporated these findings into its portfolio construction. Beyond small caps, they offer exposure to value stocks and stocks with high profitability, while excluding small stocks with aggressive investment strategies, which have historically shown lower expected returns. These academically informed adjustments aim to provide an edge over market-cap-weighted index funds.

The Blurry Line: Indexing vs. Dimensional

The distinction between indexing and DFA's approach is not always clear-cut. Both are based on the theory that risk, not stock picking or market timing, drives differences in returns. Market-cap-weighted index funds deliver the market risk premium, while DFA funds aim to deliver market, size, value, and profitability premiums. Building portfolios around multiple risk premiums is theorized to increase expected returns and their reliability over the long term, as different premiums perform well at different times, offering a form of diversification.

Performance Comparison: DFA vs. Vanguard

The crucial question is whether DFA's academic approach adds value over Vanguard's simpler market-cap-weighted index funds. The comparison must consider live funds, accounting for fees, transaction costs, foreign withholding taxes, and other implementation frictions. Vanguard offers both market-cap-weighted and style index funds (e.g., value, small-cap value).

The analysis compares the full histories of matched DFA and Vanguard US-domiciled mutual funds with at least 25 years of history, starting from the inception of the newest matched fund and ending on February 14, 2025. This is not an exercise in hindsight bias, but rather an evaluation of whether theory and evidence predict long-term outperformance.

Key Performance Observations:

• DFA US Micro Cap Portfolio: Underperformed the Vanguard 500 Index Fund since its inception in December 1981, largely due to the recent run in US large-cap growth stocks. However, it has outperformed the Vanguard Small Cap Index Fund since the latter's conversion from an active to an index fund in September 1989, and also outperformed the Vanguard 500 Index Fund over the same period.
• DFA US Small Cap Portfolio: Underperformed the Vanguard 500 Index Fund but outperformed the Vanguard Small Cap Index Fund since its inception in March 1992.
• DFA US Large Cap Value Portfolio: Trailed the Vanguard 500 Index Fund but outperformed the Vanguard Value Index Fund since its inception in February 1993.
• DFA US Small Cap Value Portfolio: Outperformed both the Vanguard 500 Index Fund and the Vanguard Small Cap Index Fund since its inception in March 1993. It has also significantly outperformed Vanguard's Small Cap Value Index Fund (launched in May 1998) since its inception.
• DFA Large Cap International Portfolio: Outperformed the Vanguard Total International Stock Index Fund since the Vanguard fund's inception in April 1996.
• DFA International Value and Small Cap Value Portfolios: Outperformed the Vanguard Total International Stock Index Fund over the same period.
• DFA Emerging Markets Portfolio: Outperformed the Vanguard Emerging Markets Stock Index Fund since the Vanguard fund's inception in May 1994. Three additional DFA Emerging Markets funds have also outperformed the Vanguard benchmark.
• DFA US Targeted Value Portfolio: Significantly outperformed the Vanguard 500 Index Fund since its inception in February 2000. Vanguard's Small Cap Value fund also outperformed the Vanguard 500 Index Fund over this period, though not as much as the DFA fund.

Recent Trends and International Markets:

DFA's recent performance has been stronger in international developed and emerging markets than in the US. This is attributed to the documented decline in "anomaly returns" (risk premiums) in the US in recent decades, while they have remained strong elsewhere. Whether this is a permanent structural change or another anomaly remains to be seen. The US market's current state bears resemblance to the year 2000, preceding a period where large-cap stocks struggled while small-cap value performed exceptionally well.

The Downside: Volatility and Pain

A significant downside to DFA funds is their potential for different performance trajectories compared to the market due to their exposure to various risk premiums. While long-term expected benefits exist, there can be periods of substantial underperformance. For instance, over the last 10 years, the DFA US Small Cap Value Portfolio trailed the Vanguard 500 Index Fund by 4.5% annualized. This is not unprecedented; from 1993 to 2000, the DFA US Small Cap Value Portfolio trailed the Vanguard 500 Index Fund by 6.3% annualized. However, after the dot-com crash, small value stocks delivered over 9% annualized returns through the "lost decade" while the US market was flat.

Despite these historical periods of pain, the DFA US Small Cap Value Portfolio has outperformed the Vanguard 500 Index Fund over its lifetime. The term "risk premiums" signifies that pursuing them can be challenging and sometimes painful.

Conclusion and Accessibility

Dimensional and Vanguard share a common origin in the index investing revolution. Vanguard's market-cap-weighted index funds have been transformative, while DFA has taken academic finance principles further, demonstrating an impressive track record relative to the broader fund management industry.

Historically, DFA funds were primarily available to institutions or retail investors through financial advisors. However, DFA began launching ETFs in the US in 2020, offering a full suite of their strategies. A competitor, Avantis, also launched ETFs in 2019. In Canada, DFA funds are still mainly accessed through financial advisors, though Manulife offers ETFs sub-advised by DFA.

While paying a financial advisor solely for access to DFA funds may not be cost-effective, finding an advisor who utilizes DFA funds can indicate a commitment to evidence-based investing.

In summary, DFA's approach, grounded in academic finance and focused on capturing multiple risk premiums, has demonstrated a strong long-term track record, often outperforming market-cap-weighted index funds, albeit with periods of significant underperformance. This highlights the trade-off between pursuing higher expected returns through systematic risk exposure and the potential for short-term pain.