Why do business managers prefer to form teams?

Many people, including business managers, believe that teams are highly effective for improving performance, but in reality the majority of teams do not live up to their reputation (either in the lab or in real business organizations).If performance were the only measure, then most corporations and other organizations should forget about teamwork and cultivate individual excellence. But performance is not
the only measure, and working in teams has many side benefits. People enjoy working with others rather than alone. Working in teams satisfies their need to belong. It enables them to feel confident, effective, and superior (if only because many members of teams think they are the star or at least a crucial team member who deserves a large share of the credit for any success the team has). The enjoyment and other psychological benefits of teams may explain why people are so eager to form and join them, even if they really do not improve performance most of the time.