Finding the middle ground between buyer and supplier by moving towards each other's position is...

Finding a middle ground, also known ascompromise or convergence, is a hallmark of collaborative or integrative negotiation. It allows both parties to secure partial wins, supports longer-term relationships, and promotes ongoing goodwill for future dealings.

“Negotiators must balance assertiveness with cooperation. Meeting halfway can lead to agreements that meet minimum needs of both parties while preserving the relationship.”

(L4M5 Commercial Negotiation, 2nd edition, Section 1.1 - Collaborative Approaches to Negotiation)