This person is referred to as Social Loafing.
The psychological phenomena known as social loafing is the belief that team members perform less in a group context. According to the social loafing effect, people don't perform their share when they're perceived as a group member.
It is seen as one of the primary causes of groups occasionally being less productive than the sum of their members' individual efforts. Rope pulling tests by Ringelmann, who discovered that persons alone tended to expend more effort while pulling a rope, served as the basis for early research on social loafing.
Studies using contemporary technology, such as online and distributed groups, have also clearly demonstrated social loafing in more recent study. The belief among group members that their individual efforts will not matter to the group is one of the main reasons of social loafing.
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