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Subjectivists begin with an example of two people getting out their preferences scales and calculating precise exchange ratio that will maximise their utility. Now setting aside that no one really owns a preference scale. This example already sets that two people will always (1/? https://twitter.com/ColeMoleson/status/1332723806729715717
have different resource endowment. This means for things to work there must always be constant reproduction of certain property relations in which people simply have to enter. So we can see something sneaky has been done, to form a theory of value they had to start with exchange
And thus abstracting it from all the social relations behind social production. Moreover, we don't produce for barter we produce for money, so in a market we are really not putting our preference scales in to consideration here, what we are thinking about is market price.
Market price which was already set before we ever get to make our subjective value judgements, subjective value theory is supposed to explain price but we now have to assume the existence of prices in order to explain subjective value judgements
