One aspect of herd behavior that is often noted is that the herd is not completely interested in protection of the group. Instead self-interest is a primary motivator. Herd animals, when they fear a predator work to get into the center of the herd so they are less vulnerable, just as people have only self-interest in mind when they knock over others to get to a cheaply sold item, or the front seats of a rock concert; or even more so when they start selling or purchasing stocks to either make a profit or make an investment that will prove profitable in the very near future.
Such things as housing prices can be determined by herd behavior and may be augmented by reports. In 2007 the Santa Rosa, California Press Democrat featured an angry letter to the editor asking them to please not write anything else on the declines in the housing market. The writer was concerned that continued reports were driving the price of his own house down; in other words he feared the herd instincts of others who would panic and try to sell before home prices dropped more, which would only lead to a drop in home prices and a flooded market.
Herd behavior may be called by other names like mob mentality. It is sometimes used disparagingly, as the term mob typically conjures up an image of a disorganized, aggressive, panicked group of people. A sudden crisis or a demonstration that gets out of order may be subject to humans herding into violent clashes with others. More simply a large group of people herding into a single area can produce panic and stampeding, riots, violence, and huge death tolls.
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