Breadth of Market Theory
A technical analysis theory that predicts the strength of the market according to the number of stocks that advance or decline in a particular trading day.
Investopedia Commentary
The breadth of market indicator is used to gauge the number of stocks advancing and declining for the day. If the breadth indicator is strong, this theory predicts that the market will be rising and vice versa.
Related Links
Discovering the Absolute-Breadth Index and the Ulcer Index
Market Breadth: A Directory of Internal Indicators
See also: Advance/Decline Line, Breadth Indicator, Technical Analysis