The thesis
“A total market fund always beats picking individual S&P 500 stocks.”
How buffet read it
$10,000 invested in Vanguard Total US Stock Market (VTI).
2016–2026, dividends reinvested.
Benchmark: S&P 500 (SPY), a proxy for broad large-cap stock picking.
Shows whether the total market index outpaced the S&P 500 over this period.
VTI · 2,679 trading days · benchmark SPY
$10,000 became
$0
The same money in the S&P 500 would have been $45,429 over 2016–2026 — the thesis came up short by $1,637.
The worst stretch
−35.0%, February 2020 to March 2020 — you would have sat through one month of that, and it took until August 2020 to get back to level.
the S&P 500 fell 33.7% at its worst over the same period. The thesis moved 18.1% a year against 17.8% for the index.
Where the thesis was wrong
The thesis lost to its benchmark. VTI returned +337.9% from 2016 to 2026; SPY returned +354.3%, a gap of $1,637 on $10,000. VTI also drew down harder in the 2020 crash, falling −35.0% against the index's −33.7%, with slightly higher annual volatility at 18.1% versus 17.8%. In every year measured, when VTI won, it won by less than when it lost, it lost by more — 2022 cost it an extra −1.3 percentage points and 2019 gave back only −0.5 in the good direction. The result depended entirely on one decade, and the small- and mid-cap exposure that distinguishes VTI from SPY did not produce the outperformance the thesis assumed it would.
Counter-test
Same money, same schedule, parked in 1–3 month T-bills instead: $12,518.
Year by year
| Year | The thesis | SPY |
|---|---|---|
| 2016 | +14.5% | +13.6% |
| 2017 | +21.2% | +21.7% |
| 2018 | −5.2% | −4.6% |
| 2019 | +30.7% | +31.2% |
| 2020 | +21.1% | +18.4% |
| 2021 | +25.7% | +28.7% |
| 2022 | −19.5% | −18.2% |
| 2023 | +26.0% | +26.2% |
| 2024 | +23.8% | +24.9% |
| 2025 | +17.1% | +17.7% |
| 2026 | +13.8% | +13.4% |
What this verdict does not include
- US-listed stocks and ETFs only, priced on end-of-day closes.
- No tax, no trading fees, no slippage, no bid-ask spread.
- Dividends are reinvested, because closes are adjusted for them.
- Survivorship is not corrected for: only instruments that exist today are held.
- Only 11 years of history exist for this. Read it accordingly.
- 'Individual S&P 500 stocks' cannot be represented as a single instrument; SPY is used as the benchmark proxy, representing the average outcome of holding the S&P 500 as a whole.
- The thesis claims 'always' — a single historical window cannot confirm or deny a universal claim. This test covers one decade only.
- VTI includes small- and mid-cap stocks beyond the S&P 500, so any outperformance may reflect that broader exposure rather than index construction alone.
Keep this thesis
buffet re-runs it once a month and mails you the new number. Nothing else is ever sent.
Another thesis
Every verdict names something it could not test. That gap is usually the next thesis.
Run another thesis — $5