The , developed by Donald Dorsey, is a momentum-based indicator designed to identify potential market turns by analyzing price volatility. Unlike indicators that focus on price direction, the Mass Index monitors the range between a security's high and low prices over a specific period.

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: Professional traders rarely use the Mass Index alone. It is frequently paired with directional tools like a Simple Moving Average (SMA) or the Relative Strength Index (RSI) to confirm the new trend's direction.