Just tips:
The S&P 500 outperforms most active funds for a structural reason that most investors never consider: It’s market-cap-weighted, so winners automatically increase their share of the index and losers decrease. The index self-corrects continuously without fees or emotions. This mechanism is why long-term returns have been so strong and why it’s worth owning.
Most people think of the S&P 500 as a stable basket of America’s 500 largest companies, something that sits there while the market moves around it. This is not entirely fair.
The index is weighted by market capitalization, which means that each company’s share of the index is proportional to its total market value. When a company grows, it automatically becomes a larger part of your portfolio. When it shrinks, it takes less. You don’t have to do anything; mechanics do the work. When a company falls so badly that it falls out of the top 500, the selection committee removes it and replaces it with a company that has risen in eligibility. The index is constantly improving.
Tesla is the clearest recent example. It wasn’t in the index at all in 2017, then entered late 2020 and quickly became a top-10 holding as the market cap grew. Meanwhile, companies like General Electric, once America’s most valuable, have been reduced to small positions or removed entirely after falling.
This structure is an important reason that the S&P 500 has outperformed actively managed funds for long periods. Fund managers charge fees to do what the index does automatically: concentrate exposure to winners and reduce exposure to losers. The index just makes it cheaper, all the time, without human error. A low-cost S&P 500 index fund or ETF (lots of fees of 0.05% or less per year) gives you access to this system for next to nothing.
The practical move is straightforward: buy a low-cost S&P 500 index fund, keep buying through market declines, and let the built-in mechanics of the index work over time. You’re not betting that 500 companies will stay great forever. You’re betting the system will continue to replace those that don’t.
Want to see it in action? This bar chart race shows the top S&P 500 companies by market cap rising and falling over three decades, and it makes the shame very concrete.
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