ELEMENTS OF EDUCATION
Stock volatility is generally a rule of the market rather than an exception. Most stock prices move up or down in any given day due to a variety of external factors. Even if the market is relatively calm, there are always stocks that are volatile. Day traders seek to identify a stock that has a trend and then go with that trend. "Trend is a friend" is a common motto among day traders. Day traders seek to pick up a relatively small stock movement, 1/8 or more on that stock. If day traders are trading a large block of shares (that is, 1,000 shares per trade), then day traders will profit $125 from a 1/8 price movement. Conversely, if a day trader acquired 1,000 shares and the trader was wrong, which also happens, then the day trader will lose $125 from a 1/8 price movement. Volatility is a double-edged sword.
For expensive stocks that trade for $100 or more, a 1/8 or 12.5 cents movement is such a small relative price change that it happens all the time. Consequently there are plenty of day trading opportunities. It is not common to see a day trader executing many, sometimes as many as 100, trades in a single day. On the other hand, an investor's time frame is much longer. Investors seek a much larger price movement than 1/8 to earn the desired rate of return. That takes time.