Concept: buy only after a failed breakdown proves itself
A lower-edge long is not the same as buying every support touch. In a rotational auction, the lower edge can be cheap, but cheap can become cheaper if value starts migrating lower. The lane requires a failed breakdown: price sweeps the visible low, triggers weak shorts or stop pressure, then reclaims the broken level with enough acceptance to show the breakdown failed.
The retail behavior matters because the fuel is different from an upper-edge short. The long wants trapped shorts below or near the reclaim area. If the crowd is mostly long and losing, a lower-edge long may be walking directly into liquidation pressure. That is why this lane cannot be promoted just because lower shelves sometimes bounce.