| Other creatures with different fundamental physical natures 
                     including plants and the lower animals  lack the capacity 
                    to act, since they lack volition: their existence is 
                    sustained by instinct and reflex. The acting man sees that 
                    these creatures are fundamentally different from him in body 
                    and mind and therefore concludes that they cannot act. 
                    However, all humans share the same fundamental physical 
                    nature: their bodies exhibit a similar appearance  all 
                    particulars of bodily dimensions, color, gender, and 
                    miscellaneous small details notwithstanding. Furthermore, 
                    the essential physical structures of every man's brain and 
                    sense organs are the same. An acting man encountering any 
                    other man will realize: "This man fulfills my previously 
                    arrived at criterion for acting beings  since he is 
                    fundamentally similar to me in his characteristics, and I 
                    know that I am an acting being."
 
 The universality of action among human beings is no mere 
                    hypothesis: it is a fact knowable with certainty. Just 
                    because we can only discover the existence of action by 
                    looking into our own minds does not mean that action is a 
                    product of our imagination, severed from reality. On the 
                    contrary, "our mind is one of acting persons. Our mental 
                    categories have to be understood as ultimately grounded in 
                    categories of action. And as soon as this is recognized, all 
                    idealistic suggestions immediately disappear" (Hoppe, 
                    "Praxeology and Economic Science: Sec. I"). The existence of 
                    our actions in reality is the very reason why we can 
                    introspect to discover the fact that we act. Implicit in 
                    action is the pursuit of ends via real means: even if the 
                    ends the actor pursues are in fact non-existent  such as 
                    the favor of the great Rain Spirit in watering his crops  his means toward pursuing that end must exist in this 
                    reality. If he does a rain dance to obtain the fictitious 
                    spirit's favor, he will be dancing with a real, physical 
                    body upon real ground, asking the Spirit to pour water on 
                    real crops.
 
 If a man acts, he must necessarily be linked to reality and 
                    able to pursue real means  otherwise, he would not be able 
                    to act. Man understands the real nature of his actions 
                    through the use of his mind  through introspection. In 
                    fact, introspection is itself an action, as are all the 
                    fundamental processes of man's mind: as "categories of 
                    action, they must be mental things as much as they are 
                    characteristics of reality. For it is through actions that 
                    the mind and reality make contact" (Hoppe, "Praxeology and 
                    Economic Science: Sec. I"). Action can be manifested in 
                    external reality, but it requires the mind to grasp. It 
                    cannot be solely a mental category detached from the outside 
                    world  since it is the prerequisite for and determinant of 
                    all human mental categories. Nor can action be a solely 
                    empirical category distinct from the operations of the 
                    individual actor's mind, since the mind  aside from being 
                    necessary for introspection  assigns to acting man his 
                    choice of ends and means. Action can be grasped by neither 
                    reason nor observation alone; in bridging the two, however, 
                    it affirms the validity of both. Since man's mind belongs to 
                    a being acting in reality, its analytical faculty  its 
                    reason  can accurately interpret human observation 
                     or the 
                    data of reality as available to the human senses. Moreover, 
                    since every man is an acting being  every man has the 
                    capacity to reason accurately and make accurate 
                    observations, if he chooses to use that capacity.
 
          
                    Since, following from the action axiom, man's reason can 
                    accurately interpret his observations, it can thereby obtain 
                    fully correct, certain knowledge about aspects of reality. 
                    The science of praxeology consists of a systematic 
                    collection of certain knowledge derived from the action 
                    axiom and known to be true. Just as the action axiom is 
                    irrefutable, so are the propositions stemming from it. Man 
                    can know the truth of praxeological propositions fully and 
                    absolutely: no amount of further experimentation or 
                    empirical evidence can refute them.
                    
 
                      
                        |          
                    Its statements and propositions are not derived from 
                    experience. They are, like those of logic and mathematics, a 
                    priori. They are not subject to verification and 
                    falsification on the ground of experience and facts. They 
                    are both logically and temporally antecedent to any 
                    comprehension of historical facts. They are a necessary 
                    requirement of any intellectual grasp of historical events. 
                    (HA, p. 32) |           
                    Praxeology offers synthetic a priori insights about reality. 
                    It requires no observation to arrive at, but nonetheless 
                    offers knowledge that no observation can possibly refute  and many observations will confirm. Furthermore, praxeology 
                    is synthetic a priori true, because its starting point 
                     the 
                    action axiom  is irrefutably correct. Praxeology is not 
                    merely analytic a priori, since it requires more than the 
                    mechanisms of formal logic to confirm: one has to be an 
                    acting being oneself in order to know of action and 
                    praxeology. While formal logic is necessary in explicating 
                    praxeology, it is not sufficient: logic is a category of 
                    action and must be preceded by it. Axioms  like the 
                    proposition that humans act  cannot be proved by means of 
                    logic alone. They are the starting points of logical systems 
                    and thus cannot be arrived at from within the systems 
                    themselves. Their truth is known more fundamentally: any 
                    attempt to refute them implicitly confirms them. 
 The action axiom makes possible the acquisition of a 
                    plethora of a priori knowledge about reality. A priori true 
                    economic propositions, however, are arrived at with especial 
                    directness: "Economic propositions flow directly from our 
                    reflectively gained knowledge of action; and the status of 
                    these propositions as a priori true statements about 
                    something real is derived from our understanding of what 
                    Mises terms 'the axiom of action'" (Hoppe, "Praxeology and 
                    Economic Science: Sec. I"). Economics, as a subcategory of 
                    praxeology, is rationally knowable not merely because of the 
                    action axiom, but as a direct derivation from it. For 
                    example, the law of diminishing marginal utility can be 
                    deduced from the action axiom. In acting, a man uses a given 
                    economic good to fulfill a set of available ends. If he 
                    values a given end above all others, he will devote his 
                    first unit of the relevant good to that end  since his 
                    valuation of that end can only be observed via the actions 
                    he takes to pursue it. He will necessarily devote his second 
                    unit of the same good to the second most subjectively valued 
                    end he deems attainable via that good's use. The value the 
                    actor derives from the use of the good's second unit is thus 
                    necessarily less than the value obtained from using its 
                    first unit: the second most valuable end is necessarily less 
                    valuable than the first. Such reasoning can be extrapolated 
                    indefinitely, applicable to as many units of a good a given 
                    economic actor might have, no matter what the identity of 
                    the actor and of the good in question might be. The law of 
                    diminishing marginal utility holds for all time periods  past, present, and future 
                     and no empirical datum could 
                    conceivably refute it.
 
 But the propositions of economics are not the sole extent of 
                    a priori knowledge made possible by the action axiom's 
                    existence. Indeed, to clearly delineate the bounds of 
                    knowledge that can be arrived at via an axiomatic-deductive 
                    approach, another a priori truth is needed: "that humans are 
                    capable of argumentation and hence know the meaning of truth 
                    and validity" (Hoppe, "On Praxeology and the Praxeological 
                    Foundations of Epistemology: Sec. III"). Hoppe's axiom of 
                    argumentation, like the action axiom, cannot be consistently 
                    denied. One's attempted refutation of the existence of human 
                    argumentation would itself be an argument.
 
 Metaphysically, argumentation is a subclass of action: to 
                    argue is to select a set of verbal and logical means to 
                    pursue the end of demonstrating something to be true or 
                    false. However, epistemologically, argumentation is prior to 
                    action: "without argumentation nothing could be said to be 
                    known about action" (Hoppe, "On Praxeology and the 
                    Praxeological Foundations of Epistemology: Sec. III"). The 
                    only way one can use argumentation is if one is an acting 
                    being. However, the only way one knows that one is an acting 
                    being is by using his reason and exercising argumentation. 
                    If one did not use argumentation (including abstaining from 
                    attempting to deny one's argumentative capacity), one would 
                    never know that one is an acting being  nor would one be 
                    able to articulate to himself or others why one pursued a 
                    given course of action. One would have to choose ends and 
                    means without knowing why one chose them. This is a 
                    contradiction in terms: the very concept of ends and means 
                    makes no sense without the actor's exercise of reason. 
                    Saying or thinking, "I chose means X to get end Y," 
                    constitutes an argument and a reason for one's action. 
                    Without the ability to convey this reason to at least 
                    oneself, one would not be able to act at all. The capacity 
                    to act implies the capacity to use argumentation.
 
 Only through argumentation can one arrive at the action 
                    axiom and the praxeological knowledge following from it. But 
                    because argumentation is, in fact, based on action, it can 
                    arrive at certain truths: "the possibility of argumentation 
                    presupposes action in that validity claims can only be 
                    explicitly discussed in the course of an argumentation if 
                    the individuals doing so already know what it means to act 
                    and to have knowledge implied in action" (Hoppe, "On 
                    Praxeology and the Praxeological Foundations of 
                    Epistemology: Sec. III"). Since we are beings who act in 
                    reality, our argumentation  being a type of action  is 
                    also in and of reality.
 
 It is possible to argue falsely: this would be a specific 
                    case of using improper means to achieve a desired end. 
                    However, correct argumentation is similarly possible, as is 
                    a more general case of using means that actually fulfill a 
                    given actor's goals. If it were impossible to act correctly, 
                    then no means selected by humans would ever arrive at ends 
                    those human beings aimed at. Since we observe ubiquitously 
                    that human beings frequently select proper means to actually 
                    fulfill their ends, we know that a correct pairing of means 
                    and ends is possible. Since argumentation facilitates the 
                    pairing of means and ends, correct argumentation must be 
                    possible as well. If correct argumentation were impossible, 
                    so would any sort of eradication of dissatisfaction  which 
                    can only come about from reaching one's chosen ends. 
                    Furthermore, if no human ends  including basic survival 
                    needs  were met, all humans would be long dead. We know 
                    that many humans exist and routinely remedy 
                    dissatisfactions; therefore, much of their action and 
                    argumentation must be correct.
 
 Since argumentation pertains to reality, man can obtain 
                    knowledge about reality by using argumentation correctly. 
                    Knowledge, the product of argumentation, is then itself a 
                    category of action.
 
 If argumentation is a subclass of action, then the realm of 
                    a priori, certain knowledge can be described as the realm of 
                    propositions that can be arrived at argumentatively, without 
                    being contingent on any additional external observations. 
                    According to Hoppe, the "task of epistemology [is] that of 
                    formulating those propositions which are argumentatively 
                    indisputable in that their truth is already implied in the 
                    very fact of making one's argument and so cannot be denied 
                    argumentatively" (Hoppe, "On Praxeology and the 
                    Praxeological Foundations of Epistemology: Sec. III"). 
                    According to Hoppe, epistemology must then "delineate the 
                    range of such a priori knowledge from the realm of 
                    propositions whose validity cannot be established in this 
                    way but require additional, contingent information for their 
                    validation, or that cannot be validated at all and so are 
                    mere metaphysical statements in the pejorative sense of the 
                    term metaphysical." Proper epistemology will tell us which 
                    facts can be known through reasoning and introspection  and 
                    which require specific observations to verify; furthermore, 
                    it will tell us which propositions are absurd or altogether 
                    irrelevant to reality. The action axiom enables such an 
                    epistemology to claim that man can be certain in the 
                    accuracy of both his a priori knowledge and his observation 
                     that no fact of reality is inherently off limits to human 
                    comprehension.
 
 Any denial of knowledge inextricably linked to the axioms of 
                    action and argumentation would entail a contradiction of 
                    one's own argument and would be refuted by one's very 
                    ability to argue. Furthermore, the realm of a priori 
                    knowledge is praxeologically constrained: it is only as 
                    broad as the categories of human action allow it to be. It 
                    is possible to have genuine a priori knowledge about 
                    something other than action, but the very pursuit knowledge 
                    can only be facilitated by action. Knowing is an end toward 
                    which deliberate physical and mental activity is a means. 
                    This praxeological constraint is in fact an assurance: it 
                    allows us to understand all genuine a priori knowledge as 
                    knowledge of reality, and not merely of the categories of 
                    our own minds. Hoppe explains: "Acting is a cognitively 
                    guided adjustment of a physical body in physical reality. 
                    And thus, there can be no doubt that a priori knowledge, 
                    conceived of as an insight into the structural constraints 
                    imposed on knowledge qua knowledge of actors, must indeed 
                    correspond to the nature of things" ("On Praxeology and the 
                    Praxeological Foundations of Epistemology: Sec. III"). 
                    Because action necessarily exists in physical reality, a 
                    priori knowledge  being a subcategory of action  must also 
                    pertain to that reality. Action and, in particular, 
                    argumentation provide a figurative bridge through which the 
                    data of reality can enter our minds and reside there without 
                    being vulnerable to further disproof or rejection.
 
 The ability to arrive at certain a priori knowledge about 
                    reality deals a mortal blow to two doctrines denying the 
                    possibility of accurate axiomatic-deductive theoretical 
                    insights: empiricism and historicism.
 
 
 |