Social loafingis a phenomenon in group dynamics defined as the tendency for individuals to expend less effort when working collectively than when working individually. This concept challenges the common assumption that the "spirit of the group" always increases individual motivation. It was famously illustrated by the Ringelmann effect, where research showed that individuals pulled less hard on a rope when they were part of a group than when they were alone.

Social loafing typically occurs because of a dispersion of responsibility; when individuals believe their contribution cannot be measured separately from the group's total output, they may feel less "accountable" and decrease their effort. It can also stem from a "sucker effect," where individuals reduce their effort because they perceive others in the group are not doing their fair share. To counter social loafing, managers are encouraged to use individual performance evaluations, provide group rewards based on individual contributions, and keep group sizes small enough that individual efforts are visible.

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