herd mentality
noun
                                
              
          
                                                      : the tendency of the people in a group to think and behave in ways that conform with others in the group rather than as individuals                                      
              
                             
Stock investors, riveted by recent market gyrations, need to resist emotional responses and the herd mentality when investing …—
Ken Schachter
                         
                
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  Merriam-Webster unabridged




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