The archive · PR & Stunts · Strategic decision · 2007–2017
Warren Buffett's decade-long $1M public bet proves a cheap index fund beats hedge funds
Backing his fee argument with $1M and a 10-year registered bet, Buffett beats a hand-picked hedge-fund basket with a low-cost S&P 500 index fund.
Warren Buffett · Ted Seides
What it had to solve
Buffett kept arguing that the fees hedge funds and their funds-of-funds charge all but guarantee a passive index fund wins over time. The industry treated the claim as one man's opinion, so he made the dispute something with a rulebook, real money and a decade-long scoreboard.
How it works
Warren Buffett had argued for years that the fees charged by hedge funds and their layered funds-of-funds make a cheap index fund the winner on average. To stop the claim being dismissed as rhetoric, he put $1 million of his own money behind a low-cost S&P 500 index fund and made the argument a formal, ten-year public bet.
The wager was registered with Long Bets, the Long Now Foundation's project for bets of long-term significance: stakes are held upfront and paid to the winner's chosen charity, a structure that also keeps the exercise legal. Ted Seides took the other side and picked the hedge-fund basket himself, so the industry could not call the test rigged. The decade included the 2008 crash, the scenario hedged strategies were built for, and the index fund still won.
By September 2017 the outcome was being reported as settled, and the Hacker News thread about it drew 786 points and 312 comments. Commenters used the result as the standing exhibit in the passive-versus-active debate: fees stacked on fees, one wrote, made the bet unwinnable from the start, and the crash that should have saved the hedgers only made the demonstration stronger.
Why it lands
- Money and an independent registry turned an opinion into an experiment: staking cash and reputation makes people commit to clear, specific claims rather than waffle.
- The opposing side chose the investments, so the hedge-fund industry could not claim the contest was rigged against it.
- The ten-year window included the 2008 crash, the moment hedged strategies were supposed to shine, and the index still won, which made the lesson hard to dismiss.
- The long clock meant the argument generated attention year after year instead of a one-off press release.
What it did
In September 2017 the result was already being reported as a win, and the Hacker News thread drew 786 points and 312 comments. Commenters treated the outcome as settled proof that fees, not stock-picking skill, decide the contest.
What you can take
Back a contested claim with your own money, a named opponent and a fixed long clock: the wager becomes years of free attention and a proof point that outlives the argument.
Since then
Seides was already being treated as the losing party months before the decade ended; the thread links his own podcast episode on the bet and a Bloomberg piece framing the counter-argument that a second ten-year cycle could go the other way. The wager became the reference point whenever index investing versus active management came up, and Long Bets kept the registration as a public record of how the contest was set up.
Sources
- Buffett wins $1M decade-old bet that the S&P500 would outperform hedgefunds (Hacker News discussion)
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