A Question I got via PM

[tolbiny]

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In any voluntary trade a person must define for them self what is fair or not fair, if there is no universal agreement on fairness the definitions of those involved must be the ones used ergo the quote "a voluntary trade is a fair trade".

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No, I can agree to a transaction and still think it's unfair.
You're basing your argument on some kind of procedural concept of fairness, which is also the libertarian view of fairness but not the only one.

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Just because fairness is subjective does not make all definitions of fair or unfair correct. The libertarian definition says nothing more than that people's actions define how they view fairness more than their words do, or that a person's actions define how much they value their own definition of fairness. When a person engages in a trade that they deem "unfair" they are saying that what they got in the trade is worth more than what they gave up + the amount that they value fairness. It is fairly irrelevant which definition you take from the libertarian perspective, the person either willingly gives up their definition of fairness, or the person's actions define fairness better than his words.