Zero-sum vs positive-sum
A zero-sum game is one where one person’s gain is another’s exact loss — the pie is fixed. A positive-sum game is one where exchange and cooperation grow the pie, so everyone can come out ahead. Knowing which you’re in changes how you should play.
How it works
For any interaction, ask whether the total value is fixed (zero-sum) or can be expanded (positive-sum). In zero-sum games, compete for your share; in positive-sum ones, the bigger win usually comes from cooperating to enlarge the whole — and the two demand opposite strategies.
Ask 'can we make the pie bigger?' before fighting over how to split it.
How to use it
- Choosing the right posture — compete in zero-sum games, collaborate in positive-sum ones.
- Recognising that most of life (trade, relationships, knowledge) is positive-sum, not a fight over a fixed pie.
- Spotting when someone wrongly treats a positive-sum situation as zero-sum (and loses by it).
Worked example
Two countries trading: each exports what it makes cheaply and imports what it doesn’t — both end up richer (positive-sum). Treating the same trade as zero-sum ("their gain is our loss") leads to tariffs that shrink the pie and leave both worse off.
Where it fails
Not everything is positive-sum — some competitions genuinely are zero-sum (a single job, a fixed prize), and naïvely cooperating there gets you exploited. The error runs both ways: treating zero-sum games as positive-sum is as costly as the reverse.
- Most real games are mixed: cooperative while the pie grows, competitive over who captures each slice, so a single label misleads.
- The same game can shift from positive-sum to zero-sum as conditions change, so a fixed classification goes stale.
- Because your own behaviour shapes the other party's, mislabeling a game tends to become self-fulfilling.
The counter-model: Prisoner's dilemma — The prisoner's dilemma shows how a genuinely positive-sum situation still collapses into mutual defection when players can't trust each other.
How to apply it, step by step
- Describe the interaction and list what each side gains and loses.
- Ask whether cooperation could enlarge the total outcome or whether one gain forces another's loss.
- Separate the value-creating phase from the value-capturing phase, which may differ.
- Cooperate where the pie can grow, but protect yourself where the game is truly fixed.
The deeper point
Much of human conflict comes from misreading positive-sum games as zero-sum ones — seeing another’s gain as your loss when both could grow. The most valuable shift in perspective is often simply asking "can we make the pie bigger?" before fighting over how to split it.
Frequently asked
- What is the difference between zero-sum and positive-sum?
- In a zero-sum game the total is fixed, so one person’s gain is another’s loss. In a positive-sum game cooperation and exchange grow the total, so everyone can come out ahead. They demand opposite strategies.
- What is an example of a positive-sum game?
- Trade: each party exchanges what it values less for what it values more, so both end up better off. Knowledge-sharing and most healthy relationships are also positive-sum — the pie grows rather than just being divided.
- Why does it matter whether a game is zero-sum?
- Because it determines whether to compete or cooperate. Treating a positive-sum situation as a fight over a fixed pie (or vice versa) leads to strategies that destroy value or get you exploited.
Related
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See this alongside the other thinking tools of negotiation.
The books behind better thinking
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- Thinking, Fast and Slow — Daniel Kahneman
- The Art of Thinking Clearly — Rolf Dobelli
- The Great Mental Models, Volume 1 — Shane Parrish
- Poor Charlie’s Almanack — Charlie Munger
- Super Thinking — Gabriel Weinberg & Lauren McCann
- Seeking Wisdom — Peter Bevelin
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Cite this page
ReadGlobe. (2026). Zero-sum vs positive-sum. https://readglobe.com/model/zero-sum-vs-positive-sum/
"Zero-sum vs positive-sum." ReadGlobe, 29 May 2026, readglobe.com/model/zero-sum-vs-positive-sum/.
Primary source: Wikipedia
Editorial synthesis © ReadGlobe 2026, drawing on the mental-models tradition (Charlie Munger, Farnam Street) and the primary sources for each model. · Last reviewed 2026-05-29.