A few months back Adam Grant was on the 10% Happier podcast. He is a professor of organizational psychology at Wharton, he focuses on workplace issues and has his own podcast about it. His recent work, including a book, is about what he calls givers, takers and matchers. I just came across his TED talk and thought it did a really good job of summarizing his thoughts and applies to pretty much all group dynamics.
What I liked most was his divorcing giving and taking from being agreeable and disagreeable. Also, pronoia.