# Zero Sum Game **The model:** A strategic interaction where one player's gain is exactly another player's loss — the total payoff sums to zero. Card games where players bet against each other, chess and other competitive games, and many trading-floor interactions have approximately zero-sum structure. The mental-model importance, however, is recognizing when situations are *not* zero-sum despite being framed that way. Most economic interactions, most political coalitions, and most policy questions are positive-sum (mutually beneficial trades, expanding the total pie) or negative-sum (mutual destruction). Treating positive-sum situations as zero-sum produces predictable failure: the parties fight over division when they could be expanding the total. The contemporary right-wing political frame frequently presents positive-sum questions (immigration, trade, education) in zero-sum terms — "they take from us" — which produces both the political mobilization and the policy failures the frame predicts. ## KB Applications ### Immigration as Zero-Sum Framing "Immigrants take jobs from natives" is a zero-sum framing of what economic literature generally treats as a positive-sum or neutral phenomenon. Empirical evidence supports positive net effects on aggregate output, mixed effects on specific sectors, and minimal effects on overall wage levels for natives. The zero-sum framing produces political mobilization that the positive-sum empirical picture wouldn't support; the political function is more important than the empirical accuracy. ### Trade Wars Tariff disputes have zero-sum-game features (one country's tariff revenue is another country's lost trade) and positive-sum features (free trade benefits both countries on average). Treating trade as pure zero-sum produces predictable outcomes — tariffs that hurt the imposing country more than the targeted country, as measured by standard trade economics. The Trump-era trade-war record (2018-2024 and 2025-) is consistent with this prediction. ### Why Zero-Sum Politics Is Particularly Damaging A specific structural feature: zero-sum framing makes coalition-building structurally impossible. If every policy is "us vs. them," there's no room for win-win arrangements. The contemporary politics's zero-sum framing has destroyed many previously-possible coalitions (immigration reform, climate policy, infrastructure investment), each of which had positive-sum bipartisan support before being reframed as zero-sum identity politics. ## See Also - [[Nash Equilibrium]] — game-theoretic framework applies to zero-sum and non-zero-sum games - [[Prisoners Dilemma]] — the canonical non-zero-sum game - [[Tit-for-Tat]] — strategy that works in non-zero-sum iterated games - [[Chicken Game]] — non-zero-sum; mutual crash is catastrophic for both - [[Game Theory Hub]] — hub page