Mathematically, the more-is-better assumption is called the rationality assumption.

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The more-is-better assumption is related to preferences indicating that having more of a good is preferred to less, but it is not called the rationality assumption. The rationality assumption in economics and decision theory typically refers to the idea that individuals make decisions based on maximizing their utility or benefit, given their preferences and constraints.

Mathematically, the More-Is-Better Assumption Is Called the Rationality Assumption