In business, as in life, people may ask you to halve the difference in order to come to a mutually agreeable value.
Simply because someone offers a change, you do not have to counteroffer.Your moves do not have to mirror those of the other party.Take a breath (or a day); resist rushing to react.Recognize that your response will set expectations for future negotiations, perhaps also with other parties.Know your floor, the point at which the deal is no longer worthwhile.The point is to plan how you will respond to some bargaining gambits.