Because of the presence of a neutral negotiator power in between. Suppose your classmate took your chocolate, and you took their cookies. Now how will they be sure you give the cookies back and take your chocolate. Enter the neutral negotiator; your teacher or teacher’s assistant. They’ll be in between, and will ensure you give them their cookies back and they return your chocolate, if any of you does something wrong there’ll be a slap. So that’s how it works
TL;DR: There’s always a third person involved and checking
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