Harsanyi's utility aggregation framework holds that interpersonal utility comparisons can be normalized so that any two-player game with opposed interests is representable as zero-sum under an appropriate cardinal rescaling.

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Cardinal rescaling(as the mathematical technique that makes the conversion possible): Adjusting numerical measurements of something (like happiness scores) by multiplying or stretching them so they can be fairly compared.
Harsanyi(game theory and decision-making under uncertainty): John Harsanyi was a Hungarian-American economist and philosopher who developed a mathematical framework for understanding how people make decisions when they don't have complete information about others' beliefs or preferences.
Interpersonal utility comparisons(Distinguished into comparisons of levels vs. differences in the literature): Comparisons of utility levels or utility differences across distinct individuals, used to ground distributive evaluations such as egalitarianism and utilitarianism.
Opposed interests(as the condition describing conflict between players): When two people want different things or benefit from opposite outcomes.

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