ZOPA
Updated 2026-08-09
INTRODUCTION
English translation pending.
CORE DEFINITION
In negotiation analysis, the zone of possible agreement is the range of terms acceptable to both parties, bounded above by the buyer's highest acceptable price and below by the seller's lowest. If the buyer's maximum falls below the seller's minimum, no zone exists and no agreement is reachable without changing the terms. The zone's existence and width depend on each side's best alternative to a negotiated agreement, since a strong alternative shifts the reservation point.
SCAFFOLDING EFFECT
Reduce cognitive load
- Estimate your reservation: set your walk-away point from your best alternative before negotiating. - Probe theirs: learn the counterparty's constraints to estimate their reservation point. - Test for a zone: confirm that an overlap exists before investing time in detailed bargaining.
Anchor fast decisions
Each party has a point beyond which its best alternative is preferable to any deal, and that point sets a reservation value. A deal exists only where the two ranges overlap, so the width of the overlap bounds what is achievable. Changing the alternatives changes the reservation points, which is why improving your outside option expands the zone in your favour.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Zone_of_possible_agreementverified
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