There has been plenty of research carried out on how positivity affects teamwork. Since the 1970s Dr John M. Gottman (https://www.gottman.com/about/research/couples/) has been studying one of the smallest, most ubiquitous of teams - married couples. In a series of interviews, he tested each couple by asking them to fix an area of conflict in their relationship within 15 minutes. He then observed the couple's interactions.
His critical observation was that those who were able to resolve their conflict had a high degree of positivity in their conversation. He went on to predict, with a high degree of accuracy, which couples would stand the test of time and which would not.
He found that relationships ...
