Alexander Linsbichler

Current debates between behavioural and orthodox economists indicate that the role and epistemological status of first principles is a particularly pressing problem in economics. As an alleged paragon of extreme apriorism, the methodology of Austrian economics in Mises’ tradition is often dismissed as untenable in the light of modern philosophy. In particular, the defence of the so-called fundamental axiom of praxeology—“Man acts.”—by means of pure intuition is almost unanimously rejected. However, in recently resurfacing debates, the extremeness of Mises’ epistemological position has been called into question. Rather than directly engaging in these exegetical discussions, this paper aims to substantiate the possibility and plausibility of conventionalist defences of praxeology per se. The proposed shift includes settling for an analytic fundamental axiom and acknowledging the prima facie tenability of other research programs than praxeology. Since conventionalist praxeology is only moderately aprioristic, mainstream economists and philosophers might be more likely to engage in fruitful discussions with those Austrian scholars who elaborate pragmatic arguments for praxeology instead of invoking pure intuition.

Alex has written an excellent thesis in the area of computable model theory. The latter is a subject that nicely combines model-theoretic ideas with delicate recursiontheoretic constructions. The results demand good knowledge of both fields. In his thesis, Alex begins by reviewing the essential model-theoretic facts, especially the Baldwin-Lachlan result about uncountably categorical theories. This he follows with a brief discussion of recursion theory, including mention of the priority method. The deepest part of the thesis concerns the study of the recursive spectrum of an uncountably categorical theory, i.e. the set of n ≤ ! such that the n-th model of the theory (in the Baldwin-Lachlan sense) has a computable presentation. This is a deep and very active area of conteporary research in computable model theory which Alex discusses in considerable detail. The exposition is very good and therefore the thesis makes a nice introduction to the subject for a wide community of logicians. (Sy-David Friedman, Professor of Mathematical Logic, Director of the Kurt Godel Research Center for Mathematical Logic, University of Vienna)

Im Rahmen dieses Beitrags beleuchten wir, wie Hans Hahn die Einflüsse Russells und Wittgensteins adaptiert, um seine individuelle Variante von Logizismus zu entwickeln. Von Bedeutung ist in diesem Zusammenhang Hahns unterschätzte Vorreiterrolle in der Entwicklung des logischen Toleranzprinzips und des logischen Pluralismus, also der Loslösung von der Vorstellung einer einzigen „korrekten“ Logik. Die detaillierten Arbeiten Uebels (2007, 2009) zur Entwicklung des logischen Pluralismus im Wiener Kreis verdienen zumindest zwei punktuelle Ergänzungen: Erstens untermauern die in diesem Kontext bisher unberücksichtigten Protokolle des Wiener Kreises sowie Vorlesungsmitschriften Hermann Brochs die von Uebel im Gegensatz zu Goldfarb (1996) beschriebene Distanzierung Hahns von Wittgenstein. Zweitens relativieren Hahns und Mengers Arbeiten zu Occams Rasiermesser Uebels Einschätzung, Mengers Beitrag zum Toleranzprinzip sei „wenig philosophisch“.

This book presents a concise introduction to the epistemology and methodology of the Austrian School of economics as defended by Ludwig von Mises. The author provides an innovative interpretation of Mises’ arguments in favour of the a priori truth of praxeology, the received view of which contributed to the academic marginalisation of the Austrian School. The study puts forward a unique argument that Mises – perhaps unintentionally – defends a form of conventionalism. Chapters in the book include detailed discussions of individualism, historicism, epistemological positions, and essentialism. The author goes on to discuss Mises’ justification of the fundamental axiom and proposes a conventionalist interpretation. By presenting praxeology as a conventionalist research programme, the author aims to reinvigorate the interaction between the Austrian School, mainstream economics, and the philosophy of science. This comprehensive reconstruction is suitable for economists interested in the history and philosophy of their discipline, as well as for philosophers of science.

In the first part of this paper I review the two most recent biographies on Otto Neurath and Ludwig von Mises as well as the scarce literature on the relations between their lives and ideas. Recent publications by Nemeth, O’Neill, and Uebel reflect growing interest in the connections between these two main proponents of Logical Empiricism and the Austrian School of Economics respectively, but are mainly focused on the so-called socialist calculation debates. In the second part I propose that additional research on Neurath’s and Mises’ idiosyncratic positions is likely to uncover general relations between epistemological assumptions, economic theories, and political views.