Anyone who denies that rights exist contradicts himself since, by his very engaging in the cooperative and conflict-free activity of argumentation, he necessarily recognizes the right of his listener to be free to listen, think, and decide. That is, any participant in discourse presupposes the non-aggression axiom, the libertarian view that one may not initiate force against others.

Thus, according to Hoppe, anyone who would ever deny the ethics underlying the free market is already, by his very engaging in the civilized activity of discourse, presupposing the very ethics that he is challenging. This is a powerful argument because, instead of seeking to persuade someone to accept a new position, it points out to him a position that he already maintains, a position that he necessarily maintains. Opponents of liberty undercut their own position as soon as they begin to state it.

- Stephan Kinsella