Seven mental models for markets, risk, and edge — each a single idea to play with. The thread: returns come from the distance between what is true and what is priced, and the discipline to act only when you can name that distance.
Most investors diversify their conviction away — they find a mispricing, believe it deeply, then allocate a standard 2% anyway. The edge is calibrating capital to clarity, then bearing the volatility concentration brings.
Enough to matter, not enough to ruin.
Ninety-nine percent of the time, you make money by waiting. The reward structure is inverted from the rest of work: most of the return is generated by doing nothing for long stretches.
Taking profits early is the expensive instinct.
Two propositions that sound contradictory but aren't. Prices take time to reflect information; over enough time they converge on fundamentals. The lag between the two is the entire basis for active investing.
The gap narrows as information diffuses.
A thought experiment: superintelligence arrives, rational, with capital. Markets become immediately efficient. The very gap returns lived in shrinks toward zero — and alpha thins.
The last durable trade may be owning the efficiency itself.
To make money, understand three things about a mispricing. Without all three, a gap can persist indefinitely — and an indefinitely deferred payout has a present value approaching zero.
A mispricing without a catalyst can wait forever.
The litmus test of a single position is the risk-return tradeoff, not the result — judging a strategy by one outcome confuses noise for signal. But a portfolio is a population of samples, and over enough bets the law of large numbers is your ally.
The single bet can be right and lose. The book should not.
The valuable contrarian position has a specific, articulable reason the consensus is mispriced — usually that the market is right about the facts but wrong about the interpretation, or right near-term but wrong about the terminal state.
The market correct on facts, wrong on interpretation.
Edge is rented, not owned — it exists only while someone else's model is incomplete. Name the gap, size the bet to your conviction, hold through the compounding, and judge the book, not the bet. Then watch the resource you harvest get scarcer.