[Felz]

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Justice has to do with giving people what they are due; if someone owns property, then they have the right to do do with it what they please (so long as they show others the same respect). Hence, all coercive transactions are unjust, and voluntary transactions are just.

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This is purely an opinion and not a fact. There is more to economics than mises.org brings to the table.
I could just as easily claim that private property in itself is coercive and unjust making any transactions involving the transfer of private ownership unjust. And this is referring to procedural justice.