It Does Not Always Work To Persuade While You Negotiate.
There is a lot of interesting psychology in these negotiations.
The first thing that happens in most negotiations is that either the buyer or the seller makes an offer. That initial offer serves as an anchor. Research on the rules that people use to make judgments suggests that we often use a strategy called anchoring and adjustment. According to this strategy, we start with some anchor point and then adjust our belief about the true value based on other information.
In the case of a negotiation, we know that people try to buy low and sell high. So, if the buyer makes an offer, the seller knows that the initial offer needs to be adjusted upward to get a fair price.