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Beta
How strongly a share swings compared with the overall market.
Beta measures how a share reacts to moves in its benchmark index. A beta of 1 means it moves on average like the market; 1.5 means that if the market rises 10 %, the share rises 15 % on average, and the same when falling. Below 1 it swings less.
Beta is based on the past and can change. It helps estimate how strongly a share is likely to be dragged down in a correction.