Chapter XII introduces Percy Thomas, a cotton expert Livingston admires. The chapter examines the influence of a persuasive and knowledgeable person on Livingston’s independent judgment. The caution is not that outside knowledge is useless, but that adopting another person’s conviction can obscure responsibility for one’s own decisions.
Ask what an expert knows, how that knowledge connects to the claim, and what might make the conclusion wrong. Domain knowledge does not automatically establish the timing, size, or suitability of a trade. Nor does disagreeing with an expert prove independence: the objective is an evidence-based judgment, not automatic contrarianism.
Worked example
A hypothetical fund earns 8% before a simplified annual charge of 2 percentage points. The investor keeps roughly 6% before tax. Compare that net figure with the alternative, not the manager’s gross return.
Case connection
The fund wager separates impressive professional credentials from the returns investors kept after fees. Its result is evidence about a particular comparison, not proof that every expert or active manager will fail.
Buffett’s ten-year fund wager
Source-grounded facts
Buffett’s 2017 letter reports that the S&P 500 index fund beat each of five funds-of-funds over the wager.
Context
Buffett and Protégé Partners compared an S&P 500 index fund with five funds-of-funds over ten years, from 2008 through 2017. The comparison included the returns investors retained after fees.
Outcome
One comparison fund was liquidated in 2017, a fact noted in the table. The wager illustrates costs and evaluation periods, not a universal result for every manager or decade.
Further analysis
What exactly was being compared?
The wager compared an S&P 500 index fund with five funds-of-funds selected by Protégé Partners over 2008–2017. A fund-of-funds invests through underlying funds rather than holding only an ordinary basket of shares directly. Its structure can introduce more than one layer of expenses. The question was not whether an active manager could ever beat an index in a month or a year. It concerned the returns retained by investors across a specified decade and a specified set of alternatives.
The first year did not decide the wager
All five funds-of-funds outperformed the index fund during the difficult opening year of 2008. Someone selecting only that observation could have told a very different story from the final ten-year result. That is why the evaluation period is part of the hypothesis rather than a detail to choose later. Keeping the originally agreed horizon does not mean ignoring risk along the way, but it avoids announcing a winner by stopping the comparison at whichever date favours the preferred argument.
How to read the final table
Buffett’s 2017 letter reports a 125.8% cumulative gain for the index fund and lower reported gains for each of the five comparison funds. The chart reproduces those few reported numerical observations in an original drawing. They are cumulative gains, not annual returns. A 125.8% gain turns a normalised starting value of 100 into 225.8; it does not mean the investment earned 125.8% in each year. Fund D was liquidated in 2017, a qualification that belongs next to the data rather than hidden from the comparison.
Costs matter, but the comparison is not a universal law
The wager highlights the difference between the return an investment activity generates and the return its investors actually keep. Fees can compound into a substantial difference over time. However, these funds, this benchmark, and this decade do not represent every possible strategy or future market. A claim that all active management always fails would exceed the evidence. An investor still needs to consider an appropriate benchmark, the risks taken, the terms of access, and the full costs of the available options.
What belongs in a fair comparison?
Use a common starting period, comparable reporting conventions, and the returns available to the investor after the relevant charges. Avoid mixing a cumulative return with an annual percentage, a surviving fund with a disappearing one, or a gross marketing figure with a net benchmark figure. Differences in risk and mandate may also matter even when one final number is larger. The book connection is to independent judgment: an impressive professional story is something to examine, not a replacement for the comparison itself.
Common misconception
“The index fund gained 125.8%, so that was its annual return.” The figure covers the entire wager. Likewise, one winning historical comparison does not guarantee the same ranking in another period.
- All five funds-of-funds outperformed the index fund in the difficult first year, 2008.
- The comparison continued through the agreed decade rather than stopping after that initial result.
- Buffett’s final table reported a 125.8% gain for the index fund; none of the five funds-of-funds matched it.
Try it
Take an investment opinion and identify the claim, supporting evidence, cost to act, and a plausible reason it might be wrong.