Herd Instinct
Volume Spread Analysis glossary · Supply & Demand / Smart Money
Definition
The tendency of humans to act collectively in the face of danger or opportunity—panic-selling when a market falls sharply and rushing to buy when a market rallies. Because this behaviour is predictable, it is the foundation of every professional operator's edge: shake-outs, up-thrusts, and buying climaxes all depend on the herd reacting as expected. The professional trader isolates himself from the herd and becomes a predator rather than a victim, buying when the herd panics on bad news and selling when the herd buys on good news.
Herd Instinct in plain English
Herd Instinct is the human habit of doing what the crowd does — selling in a panic when prices crash and piling in to buy when prices soar. Because this reaction is so reliable, professionals build their whole strategy around it: the classic traps (shake-outs, up-thrusts, climaxes) all work precisely because they know the herd will react on cue. Like a wildlife predator that counts on a startled herd bolting in one direction, the pro deliberately steps outside the crowd — buying when everyone is terrified by bad news and selling when everyone is greedily buying good news.
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