According to the Pygmalion effect, expecting group members to perform well often raises their level of performance.

The Pygmalion effect, also known as the self-fulfilling prophecy, suggests that when we expect certain behaviors or outcomes from others, our expectations can influence their behaviors and outcomes. This effect has been demonstrated in studies showing that when teachers have high expectations for their students, those students tend to perform better than when teachers have low expectations. The same effect can also apply in groups or teams, where setting high expectations for group members can raise their level of performance.