Rank a basket of assets by past return, buy the winners and short the losers. The classic 12-minus-1 ranking rule, where the expected edge comes from, and the momentum crash that can give it all back in a single month.
Cross-sectional momentum is not a bet on whether a single stock rises or falls.
At a given moment, you line up a basket of assets, rank them by their past return, buy the top (the winners) and short the bottom (the losers). That is the whole idea.
What you are harvesting is not "will the market go up or down" but the persistence of relative strength between assets.
You do not ask whether stock A rises. You bet that A staying stronger than B will continue into next month.
So even if the broad market goes nowhere, the strategy can still profit as long as the gap between winners and losers keeps widening.
This idea of capturing relative ranking rather than absolute direction is the decisive difference from time-series momentum, discussed at the end.
How to Read
NASDAQ:AAPL
The classic definition traces back to Jegadeesh and Titman's 1993 paper.
You rank on the trailing 12-month return, split into winners and losers, and rebalance every month.
The key refinement is that the most recent month is excluded, a step taken to avoid contamination from short-term reversal (discussed below).
Because of this "twelve months minus one" shape, the rule is known in practice as 12-1 momentum.
The Esoteric Volumes · By Application
Capital, discipline, psychology. The chapters that sit behind technique describe the bone-work that keeps an operator in the market for years. Access requires a written application, reviewed by hand.