A bear market is another name for a lengthy downturn in share prices. Bears are investors who expect prices to fall. Bulls expect them to rise. When the pessimists have the upper hand, there are more sellers of shares than buyers, prices fall, and, if the fall is steep and long enough, you have a bear market.
But how steep does the decline have to be to qualify as a bear market? The usual answer is that there has to be a sustained fall in stock market indices of more than 20% from the recent high. Note the three parts of that definition:
To be pedantic, a 10% fall in two trading days may feel like a bear market to you, but technically, it isn't one. It's a correction. And if it takes the edge off a rampant bull market, then arguably it's a healthy development.
There is nothing healthy about a real bear market. They happen rarely. But when they do the sharpness of the decline, and its intractability, will come as a shock to investors of more recent vintage.
Source: The Bear Book, John Rothchild
If you remove the requirement for the fall in prices to be sustained, there have been many more bear markets. According to John Rothchild, an authority on the subject, 24, 25 or 26 in the last century. That's one every four years. Chances are, you're going to have to cope with at least 10 bear markets in a lifetime's investing.
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