Mimicry is a potent nonverbal form of empathy.
Adam Rifkin stashed this in Negotiation
From @bakadesuyo on how to sell:
1. Research has shown the two things a salesperson must have are 1) empathy, 2) ego drive. Mimicry is a potent nonverbal form of empathy. It may be the key to sales.
2. Mimicry makes you a better negotiator. The first words you should say in a negotiation are anything very similar to what the person on the other side of the table just said.
3. Out and out mimicking people (but not obviously) causes them to like you more and to act more kind.