
While at Cambridge, I still remember one of my finance professors saying: stocks are like cows. I assume he used this term not only to describe irrational exuberance of stock price fluctuations and booms, but also the implication that investors can have the brain capacity/ability of a cow when it comes to stocks.
Is it really irrational to follow mindlessly after a group? Yes, if you are in a position of having contradicting information, flexible time, a cynical state of mind, being the factor causing the movement, and a few other positions. However, it is also rational to follow mindlessly after a group if you are in a case of asymmetric information, believe that others have undergone the rationalization process, or even for the sake of just following others with the mindset that if you win, we all win, and if we lose, we all lose.
Irrational exuberance and rational movement is merely dependent on position. Behavioral finance attempts to predict certain movements and allocations; knowledge of the subject's perspective and position is crucial. Do you see the glass half full or half empty? That depends on your position, in reality and theory.
Position. Perspective. Before judging the perceived irrational exuberance, let us be partial to the factors that may not be in front of us...we must learn to be more empathetic to peoples' cases.