When arguing over money, negotiators often put pressure on the side that’s conceded less by claiming that it is only “fair” for both sides to concede in roughly equal amounts. “Look how much we came down,” they will say. A variant of this strategy is the proposal to “split the difference” after you’ve negotiated for some time and then reached an impasse. Both tactics are difficult to resist. Here are a couple of considerations that may help you stand your ground.