Index Funds vs. Active Funds
Warren Buffett said to put 90% of his estate into an S&P 500 index fund. Why would a "stock genius" recommend an index rather than picking individual stocks?
What Is an Index Fund?
An index fund is a fund that tracks a specific market index (the S&P 500, KOSPI, etc.) exactly. It buys all the constituents of the index by weight and replaces added/removed constituents only when the index changes.
Advantages: - Low cost: management fee of 0.03-0.2% (less than 1/10 of active funds) - Transparency: clear which stocks are held - Broad diversification: a single S&P 500 holds the top 500 U.S. companies - Tax efficiency: low turnover minimizes taxable events
Active Fund Performance: What the Data Says
S&P SPIVA (S&P Indices Versus Active) report, 2023 data: - Share of U.S. large-cap active funds that beat the S&P 500 over 15 years: about 8% - That is, 92% of active funds lagged the market average over the long run.
Korea is similar. According to Financial Supervisory Service data, the 5-year average return of domestic equity active funds mostly lagged the KOSPI.
The biggest cause of this gap is cost. When a 1-2% annual management fee compounds over 20-30 years, the difference becomes enormous.
There is no guarantee that an active fund with strong past performance will do well in the future.
When Active Funds Are Still Better
There are special areas that index funds have trouble accessing.
- Small-caps and emerging markets: large information asymmetry and inefficiency leave room for active management. - Alternative investments (private equity, hedge funds): areas with no index. - Applying specific ESG criteria: applying the inclusion/exclusion criteria a value investor wants.
However, even in these areas, it is difficult to select in advance the funds that consistently generate excess returns exceeding their high fees.
Frequently Asked Questions
Q. Are ETFs and index funds different?
An ETF (Exchange-Traded Fund) is a type of index fund. The difference is how they trade. A regular index fund trades once a day at a NAV price, whereas an ETF can be traded in real time during market hours like a stock. For long-term investing purposes, both methods produce similar effects.
Q. Which index fund/ETF should I choose?
If they track the same index, it is reasonable to choose the one with the lowest management fee (TER). For domestic S&P 500 ETFs, expense ratios vary from 0.05-0.3%. Additionally, check the trading liquidity (average daily volume), fund size, and tracking error.
Related pages
📋 Results are based on historical data; past returns do not guarantee future returns.
📋 This service is provided for educational purposes to help you understand investing, not as investment advice.