# The Problem with Equal Weight Index Funds Source: https://www.youtube.com/watch?v=xu7kMpLbJJs Recap page: https://rapidrecap.app/video/xu7kMpLbJJs Generated: 2026-01-25T11:35:56.261+00:00 --- ## Quick Overview Equal-weighted index funds generally outperform market-cap-weighted funds over the long run, as shown by historical data, because they systematically tilt toward smaller and lower-priced stocks while avoiding the negative momentum associated with over-concentration in large, high-priced stocks, though they incur higher turnover and transaction costs. **Key Points:** - The S&P 500 Equal Weight Index has historically outperformed the S&P 500 Market Cap Weighted Index over more than two decades (00:40). - Equal-weighted indices assign equal weights to all stocks, contrasting with market-cap-weighted funds which assign weights based on size (00:22). - The equal-weighted approach results in a tilt toward smaller and lower-priced stocks, leading to significantly different sector exposures (01:04, 06:22). - The equal-weighted index exhibits higher volatility (Standard Deviation 16.11% vs 17.19% for 15Y data) but historically better risk-adjusted returns (Historical Sharpe 0.653 vs 0.5429 for 15Y data) (04:44). - A key drawback of equal weighting is higher turnover; the S&P 500 Equal Weight Index had five times the turnover of the S&P 500 market-weight index over the prior 30 years (07:21). - The factor regression analysis shows the equal-weight fund loads positively on Size and Value factors and negatively on the Momentum factor (08:31). - Dimensional funds use systematic tilting (like equal weighting) to target factors like Size and Value, avoiding the negative momentum exposure inherent in cap-weighted funds (10:33, 12:22). ![Screenshot at 01:02: The video introduces the core comparison, showing that the Equal Weight S&P 500 ETF \(RSP\) historically leads the Market Cap Weighted S&P 500 ETF \(VOO\) in total return, highlighting the 2.60% vs 39.63% concentration difference in the top 10 stocks.](https://ss.rapidrecap.app/screens/xu7kMpLbJJs/00-01-02.jpg) **Context:** The video addresses the common investor question regarding the merits of equal-weighted index funds versus traditional market-capitalization-weighted index funds, using research papers from S&P Dow Jones Indices and Vanguard, along with factor regression analysis from Dimensional and performance data, to explain the historical performance, risk profile, and systematic factor exposures of each approach. ## Detailed Analysis Equal-weighted index funds systematically outperform market-cap-weighted indices over the long term because they inherently tilt toward smaller, cheaper stocks and avoid the momentum exposure inherent in cap-weighted funds, despite incurring higher turnover costs. Market-cap-weighted indices are passive, assigning weights based on market value, leading to high concentration in the largest companies, a situation that has become extreme recently (00:38, 02:28). Data shows the S&P 500 Equal Weight Index has outperformed the market-cap-weighted index over decades (00:41, 01:07). Risk metrics show the equal-weight fund has slightly higher volatility (Standard Deviation) but better risk-adjusted returns (Sharpe Ratio, Sortino Ratio) over 15 years (04:44). The factor regression analysis for the equal-weight ETF confirms it has positive loadings on Size and Value factors and a negative loading on Momentum, which explains its historical outperformance relative to the cap-weighted benchmark (08:31). Conversely, the Dimensional US Core Equity 1 Index, which uses a systematic approach to tilt factors, also shows these factor exposures but avoids the high momentum tilt of the equal-weight fund (12:19, 12:22). The primary trade-off for equal weighting is significantly higher turnover and associated costs, as the fund must constantly sell winners and buy losers to maintain equal weights (07:00, 07:25). ### Market Weighting Comparison - Market-cap weighting is the neutral representation of the market - Equal weighting assigns equal weight to all stocks regardless of size or price (02:25, 02:51). ### Historical Performance - S&P 500 Equal Weight Index outperformed the cap-weighted index over its life since 2003 (01:20) and over the longer 1971-2025 period (12:53). ### Risk and Exposure Differences - Equal-weighted indices show higher exposure to Small Cap and Value factors, and negative exposure to Momentum, compared to cap-weighted indices (04:46, 08:31). ### Turnover and Costs - Equal-weighted indices experience significantly higher turnover (five times higher over 30 years) due to constant rebalancing, leading to higher implicit costs (07:21, 07:05). ### Dimensional Approach - Dimensional funds avoid the momentum tilt of equal weighting by systematically tilting factors like Size and Value, resulting in less aggressive rebalancing (10:33, 11:50). ![Screenshot at 00:00: The presenter introduces the topic of equal-weighted index funds versus market capitalization-weighted funds.](https://ss.rapidrecap.app/screens/xu7kMpLbJJs/00-00-00.jpg) ![Screenshot at 01:02: A side-by-side comparison of holding percentages shows the extreme concentration difference: 2.60% in the top 10 stocks for Equal Weight vs. 39.63% for Market Cap Weight \(Source: YCharts\) \(01:51\).](https://ss.rapidrecap.app/screens/xu7kMpLbJJs/00-01-02.jpg) ![Screenshot at 04:44: A risk information table compares the 15-year Standard Deviation \(16.11% for Equal Weight vs. 14.80% for Cap Weight\) and Historical Sharpe Ratios, indicating higher risk but better risk-adjusted returns for Equal Weight \(04:57\).](https://ss.rapidrecap.app/screens/xu7kMpLbJJs/00-04-44.jpg) ![Screenshot at 08:15: A factor regression summary for the Invesco S&P 500 Equal Weight ETF \(RSP\) shows positive loadings on Size \(0.14\) and Value \(0.12\) and a negative loading on Momentum \(-0.11\) \(08:31\).](https://ss.rapidrecap.app/screens/xu7kMpLbJJs/00-08-15.jpg) ![Screenshot at 10:31: A graphic illustrates that Indexers aim to match index returns, while Stock Pickers target outperformance via factors like low turnover, broad diversification, and low cost, positioning Dimensional as a systematic approach between the two extremes \(10:33\).](https://ss.rapidrecap.app/screens/xu7kMpLbJJs/00-10-31.jpg)