The study of how the predictable emotional reactions of a market's participants—fear, greed, panic, and euphoria—produce the price patterns that professional operators exploit. Two principles dominate market turning points: at potential bottoms, the herd panics on bad news and sells into professional accumulation; at potential tops, the herd rushes to buy on good news, providing the liquidity professionals need to distribute. Every VSA signal (shake-out, up-thrust, buying climax, selling climax) is a manifestation of crowd psychology operating at a turning point.