One of the most common numbers you hear if you listen to stock forecasts is the "P/E ratio"--the price of the stock or market relative to the company's earnings.
Sometimes, the P/E ratio can be very useful for getting a sense of whether a stock or market is cheap or expensive.
At other times, however, the number can be highly misleading.
One of the most common ways the P/E ratio can be misused, for example, is when investors cite the P/E of a small, rapidly growing company that currently has a low (or no) profit margin. In these cases, the company will often have an astronomically high P/E on its historical earnings, which can lead some investors to conclude that it is "ridiculously priced."
What these investors often don't realize, however, is that stocks trade based on future earnings expectations, not past earnings, and the company's earnings might be expected to grow extremely rapidly in the future. Investors who are looking at the stock's price relative to possible future
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