Win-win negotiating depends on the willingness of each side to be truly empathetic to the other side's position. That's not going to happen if both sides continue to compete with each other. Power Negotiators know that acting dumb diffuses that competitive spirit and opens the door to win-win solutions. There are all kinds of ways of describing the price of something. They would tell you eleven cents per passenger mile.
Salespeople call that breaking it down to the ridiculous.
Power Negotiators think in real money terms. When that supplier tells you about a 5 increase on an item, it may not seem important enough to spend much time on. Until you start thinking of how many of those items you buy during a year. Then you find that there's enough money sitting on the table to make it well worth your while to do some Power Negotiating. I once dated a woman who had very expensive taste.