Beside real estate bubbles, there a

Beside real estate bubbles, there are stock market bubbles.In a normal market, investors buy stock in a company because they anticipate that future profits will be distributed to shareholders, or because they believe that the value of the company's assets will increase.The share price depends on how certain investors are that these gains will materialize- and uncertainty usually is enough to keep prices within reason.Sometime, though,a "herd mentality" sets in and too many investors to buy driving prices to levels that prove unrealistic.Eventually, the price collapse. A when this happens to many companies simultaneously, it is called a stock market crash, with panicked investors selling so much stock that the market can drop a staggering amount in a single day