Human Action, by Ludwig von Mises is the cornerstone of the Austrian school of economics. They are the good guys, the ones who get it right. They keep their eye on reality rather than utopia—the no free lunch, alternatives exclude, things fade group.
The book was offered as a general theory of human behavior, although cast as a text on economics and considered, I believe, largely as that. Its power, however, goes beyond economics. Or maybe economics goes beyond economics. The cornerstone of the theory offered here for understanding human beings lies in this book. It is a general theory.
The world comes in neat parameters. Gravity varies inversely with the square of the distance. It does not just vary with the wind, stuck into place by an awkward constant. It is nice and crisp, like energy equals mass times the speed of light squared, or light decreases with the square of the distance. Quadratic equations are not necessary to solve such condition

s. This is important because it makes sense to then assume that a theory of human behavior should also come neat and clean. One need not keep reaching into one’s pockets looking for variables to paste into position so the system keeps spinning. We start with one rule: people act to reduce uneasiness. (And it's not even squared.)
Freud based a system on sex. He generalized that a bit into a term called libido, but sex was always central in his construction. He also needed aggression, and finally a death instinct. It all got a bit messy. That is what we do not want. Postulating a death instinct is like postulating that the Earth rests on a giant turtle, which rests on another turtle, and so on, all the way down. It is just pulled out of a work-kit to fit an odd place. Instinct itself, let alone one for death, is also just that. Calling something instinctual means it matters, but we have no idea why. We metabolize carbohydrates through the Kreb’s cycle. Okay, that explains the physical by smaller pieces of physical; but an instinct explains nothing. It just masquerades as constructive. The question becomes “how does an instinct work” and there is no Kreb’s cycle one can draw on the blackboard.
Sexual repression was prevalent in Freud’s era. He provided a service by including sexual feelings as a dimension of behavior. But it was largely the refusal to recognize these feelings that caused the mental mischief. People developed hysterical blindness because they did not want to see. That condition has essentially ceased to exist. We have a different problem today. Perhaps a little repression now would be useful. Just ask Tiger Woods. But sex was never sturdy enough to serve as the basis of human behavior. Life is not all that much fun. It is more about staying alive. Combat vets do not have wet dreams. They have nightmares. Perhaps sex can explain black widow spiders, but it was never going to work for us.
We will hang our theoretical system here on the wish to stay alive. Pleasure comes from those things that increase our ability to survive, and pain from those things that decrease it. Life is about relieving distressing feelings. We shun those situations that jeopardize our well being. Mises says we act to reduce uneasiness. I think that puts it most clearly.
Actions are complicated events, encompassing the important dimensions and entailing a series of steps. This makes it sound complicated, but so is riding a bicycle and yet once we have mastered it we give it no attention. Action is not simply movement. It is not even necessarily movement. Action is purposeful, meaning it has a mental component and is directed at a goal. That

goal enters the real world. Reflexes are not actions. Wishful thinking is not an action. Locking the door to keep someone out is an action, but so is not locking the door to allow someone in. Actions enter the causal chain of external reality to alter the sequence, or in the negative, to keep the situation as it is. In riding this bicycle one needs mind, body, and external reality. The sequence goes from uneasiness, to goal, followed by understanding causality, envisioning ways to influence reality, choosing a means, and action. This is what we do. This is what defines us as human beings. This is what defines us as individuals. It is our niche in the Universe. And it is the basis of how we should conceptualize our theory of being in the world.
Breathing is very complicated when described physiologically or biochemically. From a personal perspective it is pretty easy—just in and out. We generally pay it no attention, yet we breathe every moment of our lives. So too with actions. Do not get lost in the steps, since we do them all the time. They constitutes what we are, even if we have some trouble describing them in detail.
Having said that, mainly to help you trust that you will master action even if you can’t describe it, there is still more to say about action itself. We are talking about mind/body, subjective/objective, ordinal/cardinal. These are all major conceptual issues of living, and while we zip through them like riding a bicycle or breathing, still, looking at them closely makes sense at times.
The objective/subjective issue, for example, splits the world today. Science has been very successful in an objective world. We extract ourselves from the subject and use sensory input in measuring and making observations. Our opinions and feelings get in the way so we keep them out. We just want tensile strength or energy coefficients. This works wonderfully in calculating work loads for bridge girders

or miles per gallon for rotary engines. But it does not work on measuring feelings. Love, hate, pride, confidence are entirely subjective. If we play scientist with ourselves, we eliminate ourselves. Science eliminates the subjective from its field of observation. But subjective is the field of observation in human experience. We thereby rule ourselves off limits. There is no objective measure of how much John likes Mary. There is no way to verify that John likes Mary twice as much as he does Kristen. Cardinal numbers do not work here. There is no common denominator with which we can compare the two.
Subjectivity cannot be measured with an instrument because there is no physical substrate that correlates in a fixed ratio with it. It can be observed. We are not impotent facing subjectivity. It is just that we cannot apply arithmetic to it. Instead we rank it. Another way of saying this is that subjectively is measured in ordinal numbers. Objectivity is measured in cardinal numbers. I found these terms unfamiliar, as you might as well. Quite simply, ordinal numbers arrange items in an order, while cardinal numbers measure the number of items in an assemblage. Ordinal measures how much; cardinal measures how many. Cardinal numbers measure items from an objective perspective, they can be counted; ordinal numbers measure items from a subjective perspective, they can be valued.
If we already can ride this bicycle then why all the fuss? Because we must know our limits. The science of physics can be measured. The science of human behavior can only be understood. It cannot be measured. It is not a fault of our understanding that we have no positive emission tomography that measures how much David likes his dog. That answer does not exist in the world of things. It exists in concepts. We are stuck with that. In understanding human beings we cannot employ electron microscopes. We probably cannot call on inductive reasoning either, which is what science entails. There is no physical correlate of the issues we wish to understand. So there is nothing to be measured, counted, or induced.
But we are not lost. We exist. We can observe ourselves any time we want and in fact some of us do that occasionally. We can look at ourselves knowing that we are a part of the world and deduce information from those observations. Deduction becomes the method of human behavior, and logic becomes the “experiment” that corrects our assumptions. We can, quite simply, look at ourselves, and deduce that perhaps others feel as we do. We do not need double-blind experiments to determine that Gary likes baseball more than bridge. We understand what it means to prefer something to something else. We can see what Gary does. That is ordinal. That is where we live.
It gets better. Ordinal can become objective. In action one chooses. Suppose Kevin has a choice of having dinner with Gloria or Bridget. He can weigh all the plusses and minuses of each, and does, but we have no way of measuring the intensity of his assessments. Scientific Instruments, Inc., does not offer such a device, although perhaps eHarmony might be presumptuous enough to do so. But at some point Kevin must choose Gloria or Bridget (success not necessarily implied). There are only two ordinal numbers, first and second. The factors cannot be measured. He does not value Gloria 1.174 times more than Bridget (or visa versa). There is no ratio. There is simply one or the other. Very neat. Very objective. Such is action.
So action theory does not care what determines the choice, or how close the choice is or ratios are, etc. It just asks yes or no. Does he call Gloria or Bridget? End of praxeological science. We do not need quantities of subjectivity when studying action. We just need action, and it is observable. Check the phone records.
So we have a science by seeing what people choose. Actions speak louder than words anyway. This just cuts to the bottom line. Motives are important, but they are reflected best in what people do. We seek understanding, not the construction of a mathematical language for human behavior. Leave math for the physicists. Use understanding for the social sciences. If you question why Kevin chose Bridget over Gloria you do not need differential equations. You need context and history.
All action involves exchange. This is readily apparent in the market. The farmer brings apples and trades with the baker for bread. Or more accurately in an indirect exchange economy sells his apples and uses the money to buy the bread. But exchange apparently does not only include commodities. If Betsy refuses

a piece of pie because she is on a diet that does not involve an exchange of things. But it does involve an exchange. Betsy tolerates her hunger in this situation because she prefers that over not fitting into her jeans. She makes a choice, and it entails an objective, observable event—she either does not does not eat the pie.
Dr. Wilson sets the alarm at 5:30 am Sunday morning because he is on call at the hospital that day at 7 am. He prefers the benefits of his occupation over the comfort of a leisurely Sunday morning. Again, this is an exchange. And we can observe it by checking the parking lot for his car. Action entails intent, goal, means, and—well, action. It somehow all impinges on the real world. This contrasts with merely wanting to reach work, wishing one was at work, or thinking up excuses why one is not. Merely wanting to reach the hospital will never be an action until he leaves the house. Wishing one was at work chases its tail in the mental and never does the hard lifting of addressing the real world. Thinking up excuses for staying home is deliberating means, but there is no exchange. There is contemplation of exchange. The action is in the action. Yes or no. Get to work or call in sick. Pick one. All the rest is subjectivity, and we are “real” scientists. We are objective. Sleep in or show up. That is all we need know. The rest we can deduce.
So it is all pretty elementary. People want to stay alive, and they pursue activities consistent with that desire. Those things which increase one’s capacity to negotiate the world are experienced as pleasurable. Those things that threaten one’s functioning or prosperity are distressing. People act to reduce distress. All actions contain a mental and physical component and impinge on the material world. People pursue pleasure but not mindlessly like black widow spiders. Pleasure and actions to insure survival are inseparable. Increased capacity defines pleasure, although the experience typically remains discrete about it. But we are not essentially pleasure seeking organisms as Freud might impute. We are organisms striving for integrity, pursuing a process in which pleasure rides along for free. Perhaps that is Nature’s way of keeping us in the game.
We choose. We act. We seek survival and grab what gusto we can along the way. All the rest is means. Means defines who we are. It largely determines the quality of our trip in this world. If we see our earthly existence as a part of a longer journey, action theory has nothing to say on the subject. The only givens in praxeology are that we strive to maintain our exis

tence. How we define our existence and how we seek maintaining it is our choice, but the satisfaction of our experience will be defined by how well we perceive our success in those efforts. And again, the proof of that perception will not be measured in our words, but in our actions. Panic about dying suggests we did not rate our success too highly.
We are not merely mental. We are not merely physical. We are also not simply individual. We are a perhaps arbitrarily identified mental/physical dimension of a larger synthetic whole. We can't go too wrong when all the players are in the game. Action theory encompasses mental, physical, and the external world. For now, that appears sufficient for charting a course. And while it quietly brings all these dimensions together, it conveniently offers them in neat quantum packages. One either acts or does not act. How simple is that? Darwinism for behavior.
As a quick digression, I must say that Mises uses two words in his text that few people know and that are not in the usual dictionaries: praxeology and catallactics. These words have not caught on and perhaps get in the way. Praxeology means the study of human action. It comes from the Greek word for action, but it was not coined until the nineteenth century and carries little tradition. Catallactics means the study of market exchange. I shall frequently substitute the common terms in my book, using “action theory” for praxeology and “market theory” for catallactics. Perhaps the technical terms have gathered too much dust.
Revisiting our theory it becomes apparent that after chosing our basic building block there will be no turning back. If we are wrong it will be all the way down. But this is true of any deductive line of thought. Freud faced the same problem and that is how he got on thin ice (if any ice at all) when he interpreted disfiguring trauma as displaced castration anxiety. Soldiers blinded in combat allegedly suffered from Oedipal anxiety—like one might never be concerned about becoming blind! According to Freud overwhelming environmental events had no psychological import other than by stimulating sexual conflicts. Further, Freud felt that death caused no difficulty because humans are incapable of conceptualizing death. How hard is it to imagine yourself beng gone? Apparently even brilliant people have their defense mechanisms.