Which one of the following assumptions is not related to consumer behaviour based on the cardinal utility approach?

Which one of the following assumptions is not related to consumer behaviour based on the cardinal utility approach? Correct Answer Diminishing marginal utility of money

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On which of the following assumptions, the theory of consumer behaviour of cardinal utility approach is NOT based?
The ordinal utility analys is of consumer behaviour is considered superior to the cardinal utility analysis mainly due to the
Ordinal utility analysis of the consumer's behaviour is considered superior to the cardinal utility analysis mainly due to