Absorption and exhaustion

Two of the most useful order-flow concepts describe why a move stops. They look similar on a chart and opposite on the tape.

Absorption

Absorption is when aggressive orders keep hitting a level but price does not move, because a large passive participant is soaking up everything — filling the aggressors with resting limit orders.

Signs:

• Heavy, sustained selling on the tape (trades printing at the bid) into a support level, yet price barely ticks down.
• The bid keeps refilling: size you'd expect to be consumed reappears.
• High traded volume with little price progress.

The interpretation: a big buyer is absorbing the selling. When the sellers exhaust themselves against that wall, price often snaps the other way. Absorption is a sign of a strong passive participant quietly winning.

Exhaustion

Exhaustion is the opposite mechanism with a similar outcome: a move stops not because someone absorbs it but because the aggressors run out. The buyers who drove a rally simply stop buying.

Signs:

• A climactic surge of aggressive prints, then the tape goes quiet.
• Volume spikes on the final push, then drops sharply.
• Price stalls without obvious opposing size — the fuel is gone, not opposed.

Why distinguishing them is hard, and matters

Both can precede a reversal, so beginners conflate them. But the evidence differs: absorption shows opposing passive size doing work (refills, volume with no progress); exhaustion shows the initiating side fading (activity simply stopping). Misreading exhaustion as absorption (or vice versa) leads to fading a move that's only pausing, or expecting a bounce that never comes.

The discipline

Neither is a signal by itself. Both are context: reasons to tighten a stop, wait for confirmation, or size down — not standalone entry triggers. Confirmation (price actually turning, the tape flipping aggressor side) is what turns context into a trade.