Whereas reason is commonly viewed as a superior means to think better on one’s own, we argue that it is mainly used in our interactions with others. We produce reasons in order to justify our thoughts and actions to others and to produce arguments to convince others to think and act as we suggest. We also use reason to evaluate not so much our own thought as the reasons others produce to justify themselves or convince us.
That is from Hugo Mercier and Dan Sperber, The Enigma of Reason: A New Theory of Human Understanding, a book that I have just started to read.
They call their theory of human reason “interactionist.” They argue that when economists or psychologists find what appear to be errors of human reasoning, we are taking human reason out of its natural context by focusing on individual choice. The authors apparently are going to argue that when human reasoning is used interactively, it works better than one might expect based on looking at the individual capacity to reason.
Regardless of how that argument works out, I think that economists would do well to recognize the interactive nature of human behavior. Treat economics as the study not of autonomous individuals (“human action”) but as the study of humans interacting in the context of production and exchange. Models based on the autonomous individual sometimes work well, but my guess is that once you get beyond the most basic supply and demand story, models become very dependent on the prevailing beliefs, cultural norms, and laws in the society to which one attempts to apply the model.
There is no need for economists to commit to what Deirdre McCloskey derides as the Max U view of human nature. We can instead accommodate the view that man is a cultural animal, and that we learn our habits and beliefs from others.
Taking human beings as social animals subject to various departures from pure rationality, market exchange is still a very defensible mode of human interaction. Markets help to organize large-scale specialization and cooperation. Markets are effective learning mechanisms. If Mercier and Sperber are going to claim that our collective brain works in spite of (and perhaps even because of) the flaws of our individual reason, then I am prepared to claim that the market system is often the best tool for taking advantage of that collective brain.