The term that best describes the scenario is known as Social Loafing.
Whenever a project is to be done by a group of people, it requires equal contribution and efforts of all the members of the group. However, as the size of the group increases, some people of the group start giving less efforts and they usually does not involve themselves in the group activity. This behavior of people is known as Social Loafing. This behavior leads to inefficiency in doing the project as the speed at which earlier the work was done gets reduced and now more time will be needed to complete the work. The productivity of the whole group decreases due to some of its members. Some of the factors influencing Social Loafing include the different cultures and backgrounds of people, their expectations from co workers and many more.
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