Market Breadth (MB) Indicator: The Market Breadth Indicator tracks the difference in exchange volume of advancing vs declining stocks real time. This indicator provides a ratio for how powerful trading activity is in a session via advancing vs declining volume. Providing real time Market Breadth is particularly useful for traders to help determine if the trading session is generally trending or choppy. In addition, the indicator separates this ratio by exchange (NYSE, NASD, and ARCA). Only available for ThinkorSwim.