A price level where buying tends to step in and halt a decline. It acts like a floor until it breaks.
If a stock bounces off $100 three separate times, $100 is support — traders watch for another bounce or a breakdown.
Chart basics. A floor where buyers keep stepping in.
The price a stock keeps bouncing up from, like a floor.

A price floor where buyers step in.
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by Burton G. Malkiel
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