Advance-Decline (A-D) -- Assessment of the quantities of both rising and falling stocks over a certain period. The ratio of advancing (declining) stocks to declining (advancing) stocks is a general indicator of the way the market is moving. In the course of a day, a market will be bullish if more stocks advance than decline. In contrast, a market will be bearish if advances are overwhelmed by declines. The slope of the A-D line gives an idea of the course of the market in terms of bullishness and bearishness.
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