Why do you try less hard when you work in a group?
Put one person on a rope and they pull hard. Add seven more and each one secretly slacks off.
When effort is pooled into one shared result and no one can see your individual contribution, people quietly reduce how hard they try. This is social loafing. The larger the group, the less each member contributes, because personal accountability gets spread thin and feels invisible.
Five people carry a heavy sofa up the stairs. Each one leans in just a little less than they would if they were moving it with one friend - and nobody admits it.
When your effort disappears into a group total, you naturally do less - even if you would deny it.
On any team project, make each person's part visible and named. The moment effort can be seen, the loafing drops.
More hands on the rope, less pull per hand.
Learn the idea and practice English at the same time.