Hm? So we were looking at the Facebook highs and lows. If we buy Facebook shares when it's at an average low, and sell the shares when they go up, you make money. Well from what I'm understanding about this.
Look: you can't predict the future. You might look at several days or several months of past Facebook stock prices, and determine what is a "high" or a "low" price during that time. But that is no guarantee of future performance. You might buy when the price is what has
historically been low, only to find that the price continues dropping until it's only 70% of what it used to be. Maybe Facebook announced something stupid, or maybe there's no discernible reason for the drop at all. Either way, you just lost 30% of your money in a matter of hours.
Or maybe you get lucky, and the price really does recover. Then you do it again with Google stock, and once again you guessed right, and the low price is only temporary, and it recovers. And maybe you guess right 50 more times. But that 51st time, you might put all your money into a stock that drops 70% in a matter of hours. And suddenly, all those unrealized gains are wiped out in an instant.
Or maybe you mostly guess right for a whole month. Or a whole year. But there's no reason to think you'll keep guessing right next year.
People who are far smarter and more knowledgeable than you lose an enormous amount of money every day buying and trading individual stocks. They simply guess wrong. They buy when they think a stock isn't going to go any lower, only to discover that it
does go lower. There's no reason to think you predictions about the future are better than theirs, and good reason to think they might be worse.
Add to that the fact that people in general are
extra irrational with their own money. You'll get greedy when you see big gains, and keep holding when you should sell. You'll panic when you see big losses, and sell when you should hold.
So if you want to gamble, listen to your dad. But if you want to save for retirement, hunker down and buy index mutual funds with the rest of us schlubs.