Game Theorycalendar_todayLast updated: Apr 2026
What is Zero-Sum Game?
/ˈzɪərəʊ sʌm ɡeɪm/
A situation in which one participant's gain is exactly equal to another's loss — so the total value available does not change. Every poker game is zero-sum; most real-world economic interactions are not.
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Everyday Example
In a poker game, every pound you win comes from another player's loss. The total money in the game is fixed — it just redistributes. This is a zero-sum game. Most business transactions are not: both buyer and seller can be better off.
publicReal-World Application
“Trade between countries is not zero-sum, despite political rhetoric suggesting otherwise. When the UK trades with Germany, both can specialise in what they produce best and import the rest — both gaining from the exchange.”
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Did you know?
John von Neumann proved in 1928 that every finite two-player zero-sum game has an optimal solution — the minimax theorem. This was the founding result of game theory, showing that strategy could be made mathematically rigorous.
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Key Insight
Mistaking non-zero-sum situations for zero-sum ones is one of the most costly errors in negotiation, diplomacy, and business. It leads to destructive competition where collaboration would create more value for everyone.
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