Market Breadth is a technical analysis indicator that measures the number of stocks advancing versus declining in a given index or market over a specified period. Strong market breadth—where a large number of stocks participate in a rally—confirms the sustainability of an uptrend. Conversely, narrow breadth—where gains are concentrated in a few heavyweights—can signal an impending reversal. Key market breadth indicators include the Advance-Decline (A/D) Line, the Arms Index (TRIN), and the percentage of stocks above their 200-day moving average.
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