Let’s look at some of the major methods behind  investing or trading and see what they can tell us.
- Trend following – If you buy what’s going up,  it will probably continue.
- Value Investing – Buy what’s undervalued  because it will eventually become overvalued.
- Seasonality – The market tends to show seasonal  patterns that you can capitalize upon.
- Band Trading – It’s possible to draw bands to  describe the nature of an investment. Those bands will allow you to sell when  the price gets too high and buy when it gets too low.
- Elliot Wave – The market moves in a sequence of  five waves up and three waves down, and if you can understand the various levels  to this, you can predict tops and bottoms.
While there are many other methods, notice how  all of these particular methods are related. What is the common element? All of  these methods tend to predict, to a certain extent, what the market will do  next. So if you are a trend follower, you are predicting that the trend will  continue. If you are a value trader you are predicting that what’s undervalued  will go up eventually.
Yet if you look at the track record of some of  the major players who used these methods, you’ll find that they are often right  less than fifty percent of the time. Good trend-followers, for example, might  make money in about 40% of their trades. But when they are right, they make huge  amounts of money.
Elliot wave traders look brilliant when they are  correct, and the media wants to interview them about what will happen next. But  when they are wrong, they can look really stupid and people start to laugh about  their predictions.
My point in mentioning all of this is to show the  importance people place on prediction. Countless books have been written about  how to “pick the right stocks.” The media tend to interview professional traders  about what stocks they are picking and why. And perhaps they’ll even show what  happened to the last set of picks and ask what happened with the losers.
I have yet to hear anyone say, “I don’t make  money picking stocks – I make money by cutting my losses short and letting my  profits run. And more importantly, I meet my investment objectives through the  judicious use of position sizing.”
Your trading style forms a basis for your beliefs  about how to enter the market. This is important because you really only trade  your beliefs about the market. It’s very hard to trade something that’s going up  if you believe it is overvalued. Similarly, it’s very hard to trade something  that’s considered undervalued, if you believe (because it is going down) that it  will continue to go down.
But it really doesn’t matter what framework you  select for picking your trades or investments. That’s only the starting point  for real success. What’s really critical is that you understand that you make  money by cutting losses short and letting profits run. This will give you a  positive expectancy system. 
And if you can do it in such a way so as to develop  a good system, then you can probably achieve your objectives through the  appropriate use of position sizing. And if you can continue to do this without  making many mistakes, then you’ll probably be happy with the results. These are  the real keys to investment success.
