Answer:
Compromise
Explanation:
This is the process where parties to negotiation shift their grounds in order to find lasting solution to a problem.
It is used in a win-loose situation like this so as to satisfy the needs of all parties involved.It is similar to sharing a piece of pie,where whatever share Mr A gets Mr B looses,but everyone has a fair share of the pie.
It is very essential as it brings about mutual understanding and solution to the problem at hand.