# Market Breadth

*Trading & Technical Analysis — Finicade finance glossary*

Market breadth measures how many stocks participate in a move, through advance-decline lines or the share trading above a moving average. Narrow breadth — an index rising on a handful of mega-caps while most stocks fall — is a classic late-cycle warning. It matters more now than historically, because cap-weighted indexes have become concentrated enough to hide a broad decline entirely.

**Also known as:** advance decline line, breadth indicators, percent above 200-day

**Related terms:** [Market Index](https://finicade.com/glossary/market-index), [Divergence](https://finicade.com/glossary/divergence), [Golden Cross](https://finicade.com/glossary/golden-cross), [Market Capitalization](https://finicade.com/glossary/market-capitalization), [Trading Volume](https://finicade.com/glossary/trading-volume)

Source: https://finicade.com/glossary/market-breadth