How long have you been meaning to sort out your investments?
A year? Three? Longer?
The information was always available. The money still never got invested.
That ends today.
The strategy Warren Buffett recommends is one of the least exciting things in finance. A low-cost S&P 500 index fund. It only asks for consistency and time.
He has even said that after his death, he wants the majority of his wife's money invested in one. His reasoning is simple. It works through uncertainty, distraction, and changing markets.
This week:
UNDER THE HOOD
🔍How the S&P 500 Actually Works
The S&P 500 sounds like a thing you buy directly. It isn't.
The S&P 500 is an index, a ranking of the 500 largest publicly traded U.S. companies. Apple. Amazon. Costco. Target. It represents about 80% of the total U.S. stock market's value.
When people say they "invest in the S&P 500," they mean buying an index fund, ETF, or mutual fund. These funds are made to closely track the S&P 500.
Here's what makes that powerful.
The index isn't weighted equally. Larger companies have more influence. This is because the index reflects the total value of each company. It also only counts shares actually available to the public, not shares locked up by insiders or founders. So, you're tracking real market activity, not paper ownership.
Size determines impact. When Apple or Microsoft moves 1%, the fund moves with it. When the company sitting at spot 490 moves 1%, the impact is minimal.
Getting in isn't automatic. A company generally needs to show positive earnings across four consecutive quarters to qualify. That means you're not just owning the 500 largest U.S. companies. You're owning the 500 largest that have proven they can make money.
The list evolves. A committee regularly removes companies that have shrunk, weakened, or stopped meeting profitability standards and replaces them.
With an S&P 500 index fund, you stop trying to pick winners. You own the whole field, and the field keeps weeding itself.
DATA
📉The Numbers Don’t Lie
Over the long term, most actively managed funds fail to outperform the S&P 500.
The SPIVA (report card for fund managers) scorecard shows that about 91% of actively managed large-cap funds underperform the S&P 500 over 15 years. Over 20 years, that number climbs closer to 95%.
Active management seems like it should work. Hire the smartest analysts, build a research team, pay a fund manager to watch the market full time. Yet, most of them don’t outperform a passive index fund.
Some absolutely do.
The challenge is identifying them before you invest. Fees make that even harder to get right.
An S&P 500 index fund like VOO charges around 0.03% annually. Many actively managed funds charge closer to 1%. That difference sounds insignificant until you stretch it across decades.
Here’s an example:
$100,000 invested · 8% annual growth · 25 years
Low-cost index fund (0.03% fee) → ~$680,000
Actively managed fund (1% fee) → ~$543,000
That gap is over $137,000 just from fees alone.
The fee itself is not the real cost. The real cost is the compounding you never get back. Every dollar leaving your account in fees is a dollar that no longer grows in future years.
Fees are guaranteed. Outperformance is not.
That's just an average. Your number depends on your fee and your fund. I built a calculator so you can see exactly what high fund fees can cost you. Plug in your own numbers and watch the gap. → Try the calculator
THE STRUCTURE
📊 ETF or mutual fund
Both track the same 500 companies. The difference is how they work day to day.
ETF e.g. VOO, SPY
Trades throughout the day like a stock
Easy to automate: buy fractional shares for as little as $1
Generally more tax-efficient
Mutual fund e.g. FXAIX, VFIAX
Trades once daily after market close
Some require a minimum investment to open
Often used inside retirement accounts like a 401(k)
Whether you are just opening your first brokerage account or already have a few accounts you haven't looked at in a while, ETFs tend to be simpler and more flexible. Start small, automate it, and get out of your own way.
MINI ACTION
✅ Four Things You Can do
Find the expense ratio on whatever you're currently invested in. Then plug it into the calculator I built and see exactly what that fee is costing you over 25 years. → Try it here
Open the 10-year chart for VOO or FXAIX and study the long-term trends.
Set up one automatic monthly investment, even if the amount feels small.
If your money is sitting in cash because you feel like you still need to "learn more first" , ask yourself how long you've been waiting to feel fully ready.
The investors who win aren't the ones who figured it out. They're the ones who stayed in.