Meaning
A situation in which whatever one side gains, the other side loses, so the net total is zero; by extension, any contest or negotiation framed as strictly win-lose with no mutual gains available. Standard in economics, politics, and everyday argument; the adjective is 'zero-sum', and the phrase is often applied loosely to things that are not literally zero-sum. Neutral analytical term, though often deployed rhetorically to frame an opponent as needlessly competitive. Regional use: General English worldwide; formal to neutral register.
Origin
The term comes from game theory. Merriam-Webster dates the first known use of 'zero-sum' to 1944, and the Oxford English Dictionary's earliest evidence is the same year; both point to mathematician John von Neumann and economist Oskar Morgenstern's book Theory of Games and Economic Behavior, which classified games such as chess where one player's winnings exactly equal the other's losses. The underlying mathematics is older: von Neumann proved his minimax theorem for two-person games in a 1928 paper now seen as founding game theory, but the label itself belongs to 1944. The metaphorical spread into politics and general rhetoric, along with frequent misuse and the eggcorn 'zero-sum gain', has been traced by the Grammarphobia language blog using dictionary citations.
Research Sources
References used to check this entry’s meaning, history, or documented forms.
Variants
- zero-sum
- zero-sum gain
- zero-sum thinking
Usage Examples
- Poker is a zero-sum game: the table's winnings exactly equal its losses.
- She argued that trade with the region is not a zero-sum game, since both economies can grow at once.
- Budget negotiations felt like a zero-sum game, with every department fighting for the same slice.