Warren Buffett's Ground Rules

6 ideas

1. Generals, Workouts, and Controls classification

   Buffett sorted every holding into three buckets. Generals were undervalued stocks whose gains depended on the market eventually repricing them. Workouts were special situations such as mergers, liquidations, and spin-offs whose returns came from a corporate event and were largely uncorrelated with the market. Controls were positions large enough to let him influence management and unlock value directly, so each bucket carried a different risk, timeline, and relationship to market swings.

2. Judge performance relative to the index

   The partnership measured itself against the Dow, dividends included, rather than by absolute gains or losses. Performance was only meaningful over rolling periods of at least three years. A year of losing less than a falling market counted as success, and a year of gaining less than a rising market counted as failure. This yardstick exposes whether a manager adds value beyond what a passive holder would earn anyway.

3. Conservative is not the same as conventional

   Buffett argued that conventional behavior, meaning doing what most institutions do, is often mistaken for conservative behavior, meaning protecting capital. A decision is conservative only if its facts and reasoning are sound, whether or not others agree with it. Following the crowd can carry hidden risk, while an unpopular, concentrated position in a deeply undervalued company can be the truly safer choice.

4. Dempster Mill asset turnaround

   Buffett bought control of Dempster Mill, a struggling windmill and farm-equipment maker, at a steep discount to its book value. He installed Harry Bottle as manager, who cut bloated inventory, closed unprofitable operations, and redeployed the freed-up cash into marketable securities. The case shows that a cheap control position can return capital by improving how assets are used, without any need for the market to rerate the stock.

5. Small capital as a structural advantage

   Because the partnership was small, it could buy obscure, illiquid, thinly traded securities that large funds cannot meaningfully hold. Mispricing concentrates in exactly those neglected corners. Viewed this way, limited size is an edge in opportunity set rather than a handicap. Returns should be expected to fall as assets grow and that edge shrinks.

6. Fee structure aligned with investor outcomes

   Buffett took no management fee. He earned 25% of annual gains only above a 6% hurdle, and any shortfall carried forward to later years. The manager therefore got paid only for outperformance and absorbed the cost of weak years. His own capital sat in the partnership alongside the limited partners, so his interests matched theirs.

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