Shape 09 · also called gains from trade
Positive-Sum
An interaction with genuine surplus: cooperation produces more total value than the parties began with.
The practical skill is separating positions from interests. Two parties with directly opposed positions frequently have differing priorities across several issues, and trading across those differences creates value that neither could have taken from the other. The characteristic failure is treating a multi-issue negotiation as a single-issue one, which converts a positive-sum problem into a zero-sum fight over the one dimension you have chosen to look at.
- How it feels
- The two sides rank the issues differently.
- Somebody would happily give up A to get B, and the other side is the reverse.
- The disagreement outcome is worse for both than several available deals.
- The argument is about one number, and there are five other variables.
- Who is playing
- Both parties — plus anyone whose consent is needed to capture the gain, and anyone who bears a cost that neither party is counting. A positive-sum deal for two can be negative-sum for three.
- Where it lands
- Value on the table stays there if the parties fight over one axis; if they trade across priorities, both end better off than the no-deal point.
- What moves it
Widen the issue set, elicit priorities on both sides, and propose several packages of equal value to you so their preferences reveal themselves without either side making a concession.
Not to be confused with
Nearly every misread in practice is a shape mistaken for its neighbour — and each of those mistakes points you at the wrong fix.
Zero-Sum
Is the total fixed? If widening the issue set changes what is available, it was never zero-sum.
The Prisoner's Dilemma
Can either side capture more by defecting after the deal? If yes, you have a positive-sum deal with an enforcement problem, which is a different fix.
Where you have already met it
Markets and Money
Every voluntary exchange that both parties repeat. Repetition is the evidence that both really were better off.
Work and Careers
Flexible hours for the person who needs them, traded against coverage the employer needs. Costless to one side, valuable to the other.
Law and Courts
Settlement. Both parties avoid the cost and variance of trial, which is real value created rather than transferred.
Family and Relationships
Chore division by preference rather than by fairness. Almost nobody hates the same tasks.