Herding is a social behavior; in fact, it is a phenomenon that reflects a contagious emotional, collective feeling. This feeling (positive or negative) spreads among investors progressively. If this doesn't make sense quite yet, hang in there - it will be the single most important contributor to your investment success.
hát igen... 
"I press keys on a keyboard all day and click a mouse in front of a glowing rectangle. Somehow that turns into food and shelter."
