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Wiktionary
zero-sum

a. Of any system where all gains are offset by exactly equal losses.

Usage examples of "zero-sum".

Pure zero-sum mercantilism, red in tooth and nail, in an environment where they have barely invented banking, never mind the limited liability company.

And you knew it was a zero-sum game at best and eventually you'd lose, but you were on the right side so that didn't matter.