The edifice of Austrian economic theory is grounded in the axiom that all humans act; they use available means to achieve certain ends. I don’t dispute this at all, nor do I dispute the theories that have been deduced from the axiom of human action. What I do dispute is the seeming assumption that the only way humans can have an affect on the physical world and the economy is through purposeful action.
Mises states that action is necessarily rational; man can overcome instinctual tendencies and burning emotions to make decisions that are in the interest of removing the greatest amount of uneasiness felt. Of course, these decisions are made in light of ex ante considerations, and the actor may wish, ex post, that he’d made some other decision, but still, purposeful action is necessarily rational: no human makes a decision that he/she doesn’t think, ex ante, will remove the greatest amount of uneasiness felt.
That said, how is there any way of knowing whether a human’s interaction with the physical or economic world is rooted in purposeful decision-making? Let’s just take an extreme example: a man receives a call from the police that his son was murdered. Rage overcomes the father and he drives his fist through the wall. Mises would likely describe this as an instance where the man took into account the discomfort felt as a result of his rage and made a decision to best assuage the rage in a violent, cathartic, physical motion. As such, his decision to punch a wall was rational, in that the man thought, at the time, that it would be the best way to remove his uneasiness. Perhaps there is some truth to this, but as an observer, Mises would really be just speculating about what was the driving force that carried the man’s fist through the wall. Another likely alternative is that the brain does not always route all sensory information directly through the logical decision-making portion of the brain to arrive at a rational ex ante decision. It could be the amygdala’s hardwiring into the shoulder, arm, and hand that propelled the fist into the wall. It could be any number of biological mechanisms determined by evolution (or a higher power) to increase a human’s likelihood of survival in some dangerous situation. Either way, to observe any one human’s interaction with the physical world and categorize it as exactly A – falling entirely in the field of purposeful human action – or B – stemming from instinct or emotion that bypassed logical consideration – is nothing but baseless speculation. I do agree with Mises that often emotions can be weighed in when a human is deciding his next action, but I don’t think that happens anywhere near 100% of the time. Certainly there is no way of knowing to what degree emotions and instinctual urges are A) used as sensory input in a logical, decision-making process or B) routed directly to some physical action, but certainly there is more to what is economically relevant than what stems from human action.
A more economically relevant example might involve the way a trader reacts when he/she sees nothing but red numbers and down arrows in his/her portfolio. Add that to the fact that everyone around is yelling, “Sell, sell, sell!”, and it’s not entirely unlikely that the trader will have a similar, automatic reaction to the surrounding stimulus, and sells the entire portfolio. This could certainly be an instance of purposeful human action, where the trader overcomes the emotion of panic and still decides that selling is a wise idea, or it could be nothing but biological tendencies to follow the herd or a hardwiring from the amygdala to the index finger hanging delicately above the sell button. Again, it is impossible to know.
We do know that there is such a thing as human action, that it is aprioristic and that any logical deductions that follow must necessarily be true in the realm of human action. But perhaps human action isn’t all there is when it comes to humans impacting the physical or economic world. Our behaviors are rooted in more than just logical decision-making using emotions and instinctual urges as sensory inputs, and as such, I think it is appropriate to have a little humility about we know to be aprioristically true and leave a little room perhaps for the teaching of behavioral economics. There is more that is economically relevant than merely purposeful human action. It may not be aprioristically true, but to focus merely on human action may be to miss the whole picture.
Thoughts?