Sales negotiation
A seller cares about price but is indifferent to the delivery lead time; the buyer wants rapid delivery but has room on price. They trade: the seller secures their price, the buyer their speed. Each gives up what costs them little and gains what matters to them.
Map your priorities and the other side's on each issue, then propose a swap: "your price against my lead time". The difference in priority is the seam of value.
Produces an agreement superior to "splitting the difference"; each walks away with the essentials.
Without information sharing, the other side's priorities remain unknown and the swap stays impossible.