Exchange-Value and Use-Value

The contrast of a $500 meal for a well-fed person and a $3 meal for someone who is chronically starving illustrates the utter incommensurability of Exchange-Value and Use-Value.  It also, by implication, illustrates the profound confusion entailed in the prevalent classification, e. g. in American Economic analysis, of a person in urgent need of medicine as a 'consumer' no different from someone seeking to purchase their third Rolls Royce.  More generally, because the primary function of Money is to facilitate exchange, Economic theory, at any level, a fundamental term of which is money, inherently abstracts from, or, perhaps, suppresses, vital interests.  Hence, any coincidence of the wealth of a nation and the well-being of a nation is accidental.