| | I would argue that "marginal utility" is induced. But its a theory that has a great number of confirmations and no contradictory evidence... as strong of an assertion as macro non-relativistic F=MA, although it is a qualitative rather than quantitative idea.
Most economic theory is deduced, yes. It claims that if certain premises are true (consistent with reality), then particular fully consistent deduced conclusions are also true.
Maybe the confusion sets in when a person looks at the above assertion "the deduced conclusions are true", they think "then the conclusions already were true before I even realized they were true, a priori!" The mistake here is that yes, in real, the concluding relationships already were true, but as an information set in your brain, the concluded relationship was not yet identified and added to your knowledge set. So the relationship existed a priori, but in your knowledge set it did not exist until the deduction was performed.
People often fail to differentiate what they think is true (their own knowledge set of relations which they believe exists in reality), what reality is, and what other people think is true.
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Austrian Economics is a collection of deduced information that has been written (encoded in various human languages on paper etc). Holding Human Action, without ever reading it, you could declare "I know Austrian Economics" by simply accepting whatever the book says as true without even reading it or deducing/confirming its information. This means there might be contradictions in your own knowledge set, and furthermore if anyone asks you a question about Austrian Economics you might have to deduce the answer for yourself (which might be wrong if you have a contradicting premise) or read the related portion of the book (which might take some time). Again the deduced conclusion did not become part of the person's knowledge set until the book was accepted as true (non-a priori)... but the conclusion was a fully self consistent relationship that existed in written form before the person accepted it as true (given the book author did not make a logical error), and if the premises are consistent with our reality then the concluding ideas are relationships that are consistent with our reality.
Unrelated: Sensory information is a form of deduced information.
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