If you have a valid basic philosophy, the fact that things change turns out to be a benefit. At least you can survive. At the very least, you will survive over the long term. But if you don’t have a valid basic philosophy, you won’t be successful because change will eventually kill you. I knew I could not predict anything, and that is why we decided to follow trends, and that is why we’ve been so successful. We simply follow trends. No matter how ridiculous those trends appear to be at the beginning, and no matter how extended or how irrational they seem at the end, we follow trends.
John W. Henry
It’s probably the question we get asked the most, and it’s definitely simple to answer: Have the markets changed? No. Markets behave the same as they did 300 hundred years ago. They are the same today because they always change. If you have a trading system that’s sound, meaning its principles are designed to adapt, you can take advantage of market changes and make money. Changes in markets are no different than changes in the business world, or in life. They will not impact negatively on you if your strategy for handling them is based on reality, flexibility and responsibility for making your own decisions. Still others are unconvinced and argue that technology erases any trading edge, thereby changing the markets. Computers don’t erase edge. For every trader with a computer program saying buy, there are nine other traders with computer programs saying sell. No matter what you do, markets go through different stages: accumulation, run up, distribution and run down. But, the belief that markets have changed (and rendered trend following dead) is vacuous thinking.
Extraordinary Popular Delusions and the Madness of Crowds is a good read for those that feel the market today is different than the past.