A market breadth indicator is a technical analysis tool that measures the participation level within a market movement — specifically, how many stocks are rising versus falling, and whether the majority of the market is confirming or diverging from the direction of the headline index. Unlike a price index (which can be moved by a few heavy-weight stocks regardless of what the rest of the market is doing), breadth indicators reveal the underlying health and sustainability of a market trend by examining the behaviour of the entire stock universe. Key market breadth indicators used in Indian equity markets include: the Advance-Decline Line (cumulative sum of advancing minus declining stocks each day), the Advance-Decline Ratio (number of advancing stocks divided by declining stocks), the percentage of Nifty 500 stocks trading above their 50-day or 200-day moving averages, and the number of 52-week highs versus 52-week lows on NSE. A rising Nifty 50 accompanied by a deteriorating Advance-Decline Line — where more stocks are declining than advancing — is a classic breadth divergence, signalling a narrow, unsustainable rally driven by only a few large-cap stocks rather than broad market participation. Strong, sustainable bull markets in India are characterised by expanding breadth across large-cap, mid-cap, and small-cap segments simultaneously.
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