| Founder | Jürgen Habermas (building on work with Karl-Otto Apel) | Hans-Hermann Hoppe |
| Intellectual Origin | Critical Theory / Frankfurt School | Austrian School / Rothbardian libertarianism |
| Main Goal | Justify moral norms through rational discourse among all affected parties. | Justify libertarian private property rights through the logical presuppositions of argumentation. |
| Major Influences | Immanuel Kant, communicative rationality, pragmatics | Ludwig von Mises, Murray Rothbard, praxeology, and Habermas’s theory of discourse |
| Core Question | Which moral norms could all affected persons rationally accept? | Which ethical norms are necessarily presupposed whenever people engage in argumentation? |
| Method | Universal practical discourse and rational consensus. | Performative contradiction: ethical claims inconsistent with the presuppositions of argumentation refute themselves. |
| View of Argumentation | A procedure for testing and justifying moral norms. | A form of human action that necessarily presupposes self-ownership and property rights. |
| Source of Ethical Validity | Norms are valid if all affected could agree to them in free and rational discourse. | Ethical norms are valid if they are logically compatible with the presuppositions of argumentation. |
| View of Consensus | Consensus is the test of moral legitimacy. | Consensus is unnecessary; logical consistency is the test of justification. |
| View of Property | Property institutions are legitimate subjects of democratic justification and legislation. | Self-ownership, homesteading, and private property are presupposed by all argumentation. |
| Political Implications | Deliberative constitutional democracy and democratic lawmaking. | Libertarianism leading to a stateless private-law (anarcho-capitalist) society. |
| Ethical Foundation | Communicative rationality and discourse. | Praxeology and the performative presuppositions of argumentation. |
| Critique of Opposing Views | Moral norms lacking universal acceptability lack legitimacy. | Non-libertarian ethical systems involve performative contradictions when defended argumentatively. |
| View of the State | Compatible with a constitutional democratic state governed by legitimate public discourse. | Existing states generally violate private property rights and therefore lack ethical justification. |
| Historical Connection | Hoppe studied under Habermas at the Goethe University Frankfurt. | Hoppe adopted Habermas’s insight that argumentation has unavoidable normative presuppositions but argued that those presuppositions logically imply libertarian self-ownership and private property rather than Habermas’s theory of democratic legitimacy. |
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