ZOPA

What is ZOPA?

ZOPA stands for zone of possible agreement: the range of outcomes both sides would accept over walking away. Each side has a reservation point, the outcome at which it is indifferent between taking the deal and leaving. The ZOPA is the overlap between the seller's floor and the buyer's ceiling. When the seller's floor sits above the buyer's ceiling, there is no ZOPA on price alone.

Why it matters to a revenue leader

Bidding costs commercial services sellers estimator time and site walks. Knowing early whether a ZOPA exists keeps that effort on deals that can close at a workable margin. The Program on Negotiation at Harvard Law School ties ZOPA to BATNA. Each side's best alternative sets its walk-away point, so the zone moves when either side's alternative gets better or worse. A seller who reads the zone well also knows when to change the shape of the deal, since terms such as scope or contract length can open a zone where price alone leaves none.

A mechanical contractor needs at least $185,000 to cover cost and margin on a chiller replacement. The building owner's budget tops out at $175,000, so there is no ZOPA on the original scope. The seller proposes reusing the existing controls, which lowers the price the contractor needs to $168,000. The zone now runs from $168,000 to $175,000, and the two sides settle at $172,000.