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IMHO this is not the correct interpretation of the EconomicSubjectivism standpoint.
But I simply don't see that here: "subjectivism" is a perfectly good simple word for the idea that individual people experience things differently, and "economicsubjectivism" uses that term well, to describe the idea that different people can value things differently.
An obvious example of economicsubjectivism is value of life - each human being's own life is valued quite highly by themselves, and much less so by others.