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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