Nir:
Misesian praxeology, as I understand it, is not simply pure logical reasoning from a single axiom, e.g., that “humans act.”
Misesian praxeology is built around a central “reference phenomenon” that Mises refers to as action. The logical reasoning in Misesian praxeology is not simply reasoning from two words “man acts,” but more accurately, conceiving consistently the means/ends relationship as that is experienced in action by means of logical reasoning, so that the formal construct that captures the phenomenon of action is consistent and not contradictory.
In Misesian praxeology, the reference phenomenon of action is central, and logical reasoning, with reference to the phenomenon of action, adjusts and corrects the formal construct, rendering it consistent and free of contradictions.
First, there is the consciousness of the phenomenon of action:
“The starting point of experimental knowledge is the cognition that an A is uniformly followed by a B. The utilization of this knowledge either for the production of B or for the avoidance of the emergence of B is called action. The primary objective of action is either to bring about B or to prevent its happening.” (Ultimate Foundations, p.20)
Then there is contemplation on the nature of action:
“The starting point of praxeology is not a choice of axioms and a decision about methods of procedure, but reflection about the essence of action.” (HA, 3rd rev. p.39)
“The only way to a congnition of these theorems is logical analysis of our inherent knowledge of action. We must bethink ourselves and reflect upon the structure of action.” (HA, 3rd rev. p.64)
Thus, Misesian praxeology is based on a “reference phenomenon” which is essentially the regular patterns that we come to notice in our action, and try to formulate into exact laws with the aid of logical reasoning. This is the general science that Mises is describing. It is based on the recognition of regular patterns of human action that we come to be conscious of as acting beings, and that we try to formulate, by means of discursive reasoning and logic, as exact laws. Any regular pattern then, in action, where an A is uniformly followed by or is co-present with a B, is a pattern that is the subject matter of praxeology in Mises’s conception, and this includes things outside the scope of economics proper (the study of market phenomena). If every time a person lies for example (an action), he/she experiences a distinct feeling, then assuming this is the case, it is the task of praxeology to conceive this phenomenon in an “If X, then Y” format as an exact law of human action. This is the general science of action of which Mises speaks, and of which economics is merely the best elaborated part.
By contrast, the Rothbardian and Rothbardian influenced interpretation of praxeology generally omits or diminishes reference to the “reference phenomenon” of action (the repeated patterns of action experienced by an actor), and generally omits or diminishes reference to exact laws of human action–clear and explicit reference to the notion that in action an A is uniformly followed by or is co-present with a B. This conception of things either results in, or is the result of, a further conception that praxeology is a kind of “reasoning” approach to specifically market phenomenna, as opposed to a general science that tries to conceive the regular patterns in all forms of human actions including non-market-related human actions (helping someone, harming someone, trying to figure out a problem, trying to overcome one’s fears, etc…).
Regarding the idea that the Rothbardian conception of praxeology is by and large synonymous with supposition/counter-supposition reasoning, here is an example taken from his essay “Praxeology: The Methodology of Austrian Economics”.
Let us consider some of the immediate implications of the action
axiom. Action implies that the individual’s behavior is purposive, in
short, that it is directed toward goals. Furthermore, the fact of his action
implies that he has consciously chosen certain means to reach his goals.
Since he wishes to attain these goals, they must be valuable to him;
accordingly he must have values that govern his choices. That he
employs means implies that he believes he has the technological
knowledge that certain means will achieve his desired ends. Let us note
that praxeology does not assume that a person’s choice of values or goals
is wise or proper or that he has chosen the technologically correct
method of reaching them. All that praxeology asserts is that the
individual actor adopts goals and believes, whether erroneously or
correctly, that he can arrive at them by the employment of certain means.
All action in the real world, furthermore, must take place through
time; all action takes place in some present and is directed toward the
future (immediate or remote) attainment of an end. If all of a person’s
desires could be instantaneously realized, there would be no reason for
him to act at all.3 Furthermore, that a ma n acts implies that he believes
action will make a difference; in other words, that he will prefer the state
of affairs resulting from action to that from no action. Action therefore
implies that man does not have omniscient knowledge of the future; for
if he had such knowledge, no action of his would make any difference.
Hence, action implies that we live in a world of an uncertain, or not fully
certain, future. Accordingly, we may amend our analysis of action to say
that a man chooses to employ means according to a technological plan in
the present because he expects to arrive at his goals at some future time.
3 In answer to the criticism that not all action is directed to some future point of time,
see Walter Block, “A Comment on ‘The Extraordinary Claim of Praxeology’ by
Professor Gutierrez,” Theory and Decision 3 (1973): 381-82.
Praxeology: The Methodology of Austrian Economics
60
The fact that people act necessarily implies that the means
employed are scarce in relation to the desired ends; for, if all means were
not scarce but superabundant, the ends would already have been attained,
and there would be no need for action. Stated another way, resources that
are superabundant no longer function as means, because they are no
longer objects of action. Thus, air is indispensable to life and hence to
the attainment of goals; however, air being superabundant is not an
object of action and therefore cannot be considered a means, but rather
what Mises called a “general condition of human welfare.” Where air is
not superabundant, it may become an object of action, for example,
where cool air is desired and warm air is transformed through air
conditioning. Even with the absurdly unlikely adve nt of Eden (or what a
few years ago was considered in some quarters to be an imminent
“postscarcity” world), in which all desires could be fulfilled
instantaneously, there would still be at least one scarce means: the
individual’s time, each unit of which if allocated to one purpose is
necessarily not allocated to some other goal. 4
Such are some of the immediate implications of the axiom of
action. We arrived at them by deducing the logical implications of the
existing fact of human action, and hence deduced true conclusions from
a true axiom. Apart from the fact that these conclusions cannot be
“tested” by historical or statistical means, there is no need to test them
since their truth has already been established. Historical fact enters into
these conclusions only by determining which branch of the theory is
applicable in any particular case. Thus, for Crusoe and Friday on their
desert island, the praxeological theory of money is only of academic,
rather than of currently applicable, interest. A fuller analysis of the
relationship between theory and history in the praxeological framework
will be considered below.
There are, then, two parts of this axiomatic-deductive method:
the process of deduction and the epistemological status of the axioms
themselves.
I underlined a few brief passages that are characteristic of Rothbard’s approach. With the above as reference, I would summarize the general difference between the Misesian conception and the Rothbardian conception of praxeology thusly:
In the Misesian conception, the “If X, then Y” propositions are propositions of the theory that refer to the regular pattern(s) in the phenomenon.
In general, Mises is concerned with the regular patterns in human action, and the supposing of an “X” is the supposing of a phenomenon X, which is followed by or is co-present with, a phenomenon Y.
As you can see, the Rothbardian conception is subtly different. Rothbard tends to conceive the “if X, then Y” propositions as parts of the theoretical reasoning process. His “if X, then Y” ‘s are “discursive suppositions.” arguing or building towards a kind of final “proof.” The "X-Y’ suppositions are “X-Y” “hypotheticals” that belong to the “praxeological” reasoning process in Rothbard’s conception of praxeology.
And as you can see, he plainly states: “There are, then, two parts of this axiomatic-deductive method: the process of deduction and the epistemological status of the axioms themselves.”
He leaves out mention of or reference to the phenomenon of action, regular patterns, exact laws, etc…
So he is not describing exactly the same thing Mises is. Mises is focused on the phenomenon of action, its regular patterns, and the conception of those regular patterns as exact laws of human action. Rothbard is focused on a process of “if-then” logical deduction from a so-called “action axiom” largely without reference to the phenomenon of action, regular patterns, and exact laws.
(I’m not aware of Mises ever referring to the “axiom of action” or an “action axiom” though he may possibly have. I believe Mises thought in terms of a “category of action” meaning, that as opposed to mechanistic nature, there is another phenomenon bringing about change in the world; man’s conscious aiming at ends. This refers to the phenomenon of consciously aiming at ends, and this phenomenon, and conceiving it consistently in terms of means and ends, was Mises’s chief concern)
Regarding your question whether other scholars have their own praxeology, I believe that followers of Rothbard including Hoppe and Long have tended to view praxeology more along the lines of “conceptual analysis” and less along the lines of regular patterns of human action conceived as exact laws.
Here is Long’s definition:
“Praxeology is the study of those aspects of human action that can be grasped a priori; in other words, it is concerned with the conceptual analysis and logical implications of preference, choice, means-end schemes, and so forth.”
“The basic principles of praxeology were first discovered by the Greek philosophers, who used them as a foundation for a eudaimonistic ethics. This approach was further developed by the Scholastics, who extended praxeological analysis to the foundations of economics and social science as well.”
“In the late nineteenth century, the praxeological approach to economics and social science was rediscovered by Carl Menger, founder of the Austrian School. The term praxeology was first applied to this approach by the later Austrian economist Ludwig von Mises (portrait at left). Along with his students (including Friedrich Hayek and Murray Rothbard), Mises employed praxeological principles to show that much existing economic and social theory was conceptually incoherent.” (emphasis added)
Thus, Rothbard conceives praxeology as supposition/counter-supposition reasoning, and Long believes that the import of Mises is his demonstration that other economic theories were conceptually incoherent.
This isn’t accurate. Mises demonstrated that resorting to definite policy means X, must necessarily result in a definite “economic” consequence Y. His point was, for example, that attempts to artificially lower the voluntary or natural rate of interest X, must have a necessary consequence Y. His concern was definitely the phenomena. His concern and focus was on the results that our attempts to influence events must necessarily produce, or what those attempts could not possibly produce. He wasn’t concerned with “conceptual coherence” per se, he was concerned with economic phenomena and the phenomena of human action.
I would speculate that Long is accessing Mises as many American libertarian scholars do, through a Rothbardian lens. And that is how he comes to the conclusion that the import of Mises and praxeology is conceptual analysis. But, paraphrasing Long, doing this “just is” interpreting Mises according to a Rothbardian view of things. To understand Mises as someone who’s chief concern is logical deduction and conceptual analysis “just is what it means” to be a Rothbardian (or someone heavily influenced by him).
If a person wants to understand Mises by reference to another scholar, they can get a better idea of what Mises is doing by reading Book 1, chapters 1 through 5 of Menger’s “Investigations Into the Method of the Social Sciences.” (40 pages in total)
There, a person will see the general blueprint for Misesian praxelogy, what Menger referred to as theoretical exact science.
One who reads these five chapters by Menger will realize that what Menger and Mises have as their aim is exact laws of human or social phenomena. Their conception of exact science or praxeology cannot be accurately characterized without referring to the idea of exact laws.
As Mises writes:
“Theory as distinct from history is the search for constant relations between entities, or, what means the same, for regularity in the succession of events.” (UF, p.16)
“Praxeological knowledge makes it possible to predict with apodictic certainty the outcome of various modes of action.” (HA, 3rd rev. p.117)