henry copeland:

Performance improves when the enemy of an enemy is a friend: Study of traders finds balanced professional networks lead to better high-risk decisions -- ScienceDaily

SBT consists of four primary rules for relationships among individuals: A friend of a friend is a friend A friend of an enemy is an enemy An enemy of an enemy is a friend An enemy of a friend is an enemy When all of these conditions are met, a network is said to be balanced. Through a two-year study of day traders, the researchers found that: (A) workers gravitate toward a state of balance in their relationships; and (B) performance improves when there is a high level of balance.
- www.sciencedaily.com