What is "framing" or a "frame" as it pertains to negotiation?

Why do researchers claim how a negotiation is framed is related to the final outcome? Give an example of changing the "frame" of some kind of negotiation and explain how the outcome may change as a result of the "framing" change.

What is reciprocity? What role does it play in negotiations? Why, in your group's opinion, is it so powerful? Give two examples of how reciprocity can work in a "typical" office setting workday.