Psychiatrists and psychologists have come to the rational conclusion that man is incapable of coming to a rational conclusion. To a certain extent there may be some truth to this. While we are still in the beginning stages of understanding our own minds, we do have three or four good theories on how our mind operates—though we are far from a comprehensive holistic understanding.
All in all many, if not most instances, of reasoning in man is what we call bounded rationality. Bounded rationality holds that when making decisions, the rational thought of individuals is limited by what information is available to them at the time they make decisions, the cognitive limitations of their minds, and the finite amount of time before a decision has to be made. Another way to look at bounded rationality is that, because decision-makers lack the ability and resources to arrive at an optimal solution, they instead simplify the choices available to them. Thus the decision-maker seeks a satisfactory solution rather than an optimal one.
In nature an animal that hesitates and remains indecisive is at a disadvantage to quicker thinking individuals—a deer stunned by car highlights too many times is not likely to survive very long. It makes sense that there are selective pressures from the environment to mold species capable of making decisions based on just a few facts and then choosing a decisive plan of action. Man is such an creature.
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